{"product_id":"sentinel-leak-sealer-1-litre-internal-weeping-joint-pinhole-leak-treatment","title":"Sentinel Leak Sealer 1 Litre - Internal Weeping Joint \u0026 Pinhole Leak Treatment","description":"\u003c!-- SEO Product Name: Sentinel Leak Sealer 1 Litre - Internal Weeping Joint \u0026 Pinhole Leak Treatment - ILS --\u003e\n\u003cdiv style=\"font-size:16px; max-width:900px; line-height:1.6; color:#1a1a1a;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSentinel Leak Sealer\u003c\/strong\u003e (MPN \u003cstrong\u003eILS\u003c\/strong\u003e) is a leave-in additive for \u003cstrong\u003esealing minor leaks and weeping joints\u003c\/strong\u003e in all types of indirect central heating systems, including those containing aluminium components. Once added, it forms a \u003cstrong\u003esoft seal over the leaking area\u003c\/strong\u003e, normally within 24 hours depending on leak rate and system temperature, without causing blockages elsewhere in the system.\u003c\/p\u003e\n\n      \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:10px; margin:20px 0;\"\u003e\n        \n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e1 Litre\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003ePack Size\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e~24 Hours\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eTypical Seal Time\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eUp to 10 Radiators\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eCoverage\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eElastomers\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eCompatible With\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eNon-Toxic\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eFormulation\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 150px; background-color:#008377CF; color:#ffffff; padding:14px 10px; border-radius:6px; text-align:center; min-width:140px;\"\u003e\n          \u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eISO 9001\u003c\/div\u003e\n          \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:0.9;\"\u003eQuality System\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"border-left:5px solid #008377CF; background-color:#e6f6f5; padding:12px 16px; border-radius:4px; margin:16px 0;\"\u003e\n        \u003cstrong style=\"color:#008377CF;\"\u003eCompatible With Existing Treatment\u003c\/strong\u003e\n        \u003cdiv style=\"margin-top:6px; font-size:15px; line-height:1.5;\"\u003eSentinel Leak Sealer is \u003cstrong\u003ecompatible with other Sentinel products\u003c\/strong\u003e that may already be present in the system, so it can generally be added without needing to drain and refill.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"border-left:5px solid #b8860b; background-color:#fdf6e3; padding:12px 16px; border-radius:4px; margin:16px 0;\"\u003e\n        \u003cstrong style=\"color:#b8860b;\"\u003eDosage Depends on System Size\u003c\/strong\u003e\n        \u003cdiv style=\"margin-top:6px; font-size:15px; line-height:1.5;\"\u003e1 litre treats a \u003cstrong\u003etypical domestic system of up to 10 radiators\u003c\/strong\u003e. Larger systems should be dosed with \u003cstrong\u003e2 litres\u003c\/strong\u003e. This product will not seal significant leaks or resolve mechanical failures - it is intended for minor weeping joints and pinhole leaks only.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"border-left:5px solid #008377CF; background-color:#e6f6f5; padding:12px 16px; border-radius:4px; margin:16px 0;\"\u003e\n        \u003cstrong style=\"color:#008377CF;\"\u003ePost-Dosing Operation\u003c\/strong\u003e\n        \u003cdiv style=\"margin-top:6px; font-size:15px; line-height:1.5;\"\u003eAfter dosing, the \u003cstrong\u003esystem should be operated normally for at least 15 minutes\u003c\/strong\u003e, as heat is beneficial to the sealing process.\u003c\/div\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:12px; margin:20px 0;\"\u003e\n        \n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eEffective on Minor Leaks\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eDesigned to \u003cstrong\u003eseal weeping joints and pinhole leaks\u003c\/strong\u003e that are too small to justify a full repair callout, extending the useful life of ageing joints and fittings.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eWon't Cause Blockages\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eFormulated to be \u003cstrong\u003ereadily dispersible\u003c\/strong\u003e, meaning it will not build up and block narrow pipework, radiator valves, or heat exchangers elsewhere in the system.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eBroad Metal Compatibility\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eSuitable for use in \u003cstrong\u003eall types of indirect central heating system\u003c\/strong\u003e, including those with aluminium components, and is \u003cstrong\u003ecompatible with elastomers\u003c\/strong\u003e such as seals and gaskets.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eCompatible with Other Treatments\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eCan be used alongside \u003cstrong\u003eexisting Sentinel inhibitor and cleaner products\u003c\/strong\u003e already circulating in the system, without needing to drain down first.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eNon-Toxic, Non-Irritant\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eFormulated to be \u003cstrong\u003enon-toxic and non-irritant\u003c\/strong\u003e, making it straightforward and low-risk to handle and dose on site.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; border:1px solid #e0e0e0; border-radius:6px; padding:14px 16px; min-width:240px;\"\u003e\n          \u003cdiv style=\"color:#008377CF; font-weight:700; font-size:15px; margin-bottom:6px;\"\u003eRapid-Dose Format Available\u003c\/div\u003e\n          \u003cdiv style=\"font-size:14px; line-height:1.5;\"\u003eWhere faster dosing is needed, Sentinel also offers this product in a \u003cstrong\u003eRapid-Dose format\u003c\/strong\u003e for quicker application directly into the system.\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003ctable style=\"width:100%; border-collapse:collapse; margin:20px 0; font-size:14px;\"\u003e\n        \n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eProduct Identity\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eManufacturer\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eSentinel (Sentinel Performance Solutions)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eProduct Name\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eSentinel Leak Sealer\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eMPN\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eILS\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eApplication\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eUse Case\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eSealing minor leaks and weeping joints\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eSystem Types\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eAll types of indirect central heating system\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eTypical Sealing Time\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eApprox. 24 hours (leak-rate and temperature dependent)\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eDosage\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eStandard Dose\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003e1 litre per typical domestic system (up to 10 radiators)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eLarger Systems\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003e2 litres\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003ePost-Dose Operation\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eRun system normally for minimum 15 minutes\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd colspan=\"2\" style=\"background-color:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; border:1px solid #008377CF;\"\u003eCompatibility\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eMetals\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eAll metals including aluminium\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eElastomers\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eCompatible with elastomers (seals, gaskets)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#f7f7f7;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eOther Sentinel Products\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eCompatible with existing Sentinel inhibitors and cleaners\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color:#ffffff;\"\u003e\n            \u003ctd style=\"padding:8px 12px; font-weight:600; border:1px solid #e5e5e5; width:40%;\"\u003eQuality System\u003c\/td\u003e\n            \u003ctd style=\"padding:8px 12px; border:1px solid #e5e5e5;\"\u003eManufactured under ISO 9001\u003c\/td\u003e\n          \u003c\/tr\u003e\n      \u003c\/table\u003e\n      \u003cdiv style=\"margin:24px 0;\"\u003e\n        \n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat size leaks will this product seal?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eSentinel Leak Sealer is designed for \u003cstrong\u003eminor leaks and weeping joints\u003c\/strong\u003e - not significant leaks, mechanical failures, or large pipe splits, which require a physical repair.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eHow long does it take to seal a leak?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eA soft seal typically forms \u003cstrong\u003ewithin 24 hours\u003c\/strong\u003e, though this depends on the rate of the leak and the system's operating temperature.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWill it block my radiators or pipework?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eNo. The formulation is \u003cstrong\u003ereadily dispersible\u003c\/strong\u003e and is specifically designed not to cause blockages elsewhere in the system.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eHow much do I need for my system?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003e\n\u003cstrong\u003e1 litre treats a typical domestic system of up to 10 radiators.\u003c\/strong\u003e Larger systems should be dosed with 2 litres.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eCan I use this alongside my existing inhibitor?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eYes, Sentinel Leak Sealer is \u003cstrong\u003ecompatible with other Sentinel products\u003c\/strong\u003e already circulating in the system.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003cdetails style=\"margin-bottom:8px; border:1px solid #e0e0e0; border-radius:6px; overflow:hidden;\"\u003e\n        \u003csummary style=\"background-color:#008377CF; color:#ffffff; padding:10px 14px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat should I do after dosing?\u003c\/summary\u003e\n        \u003cdiv style=\"padding:12px 14px; font-size:14px; line-height:1.6;\"\u003eOperate the \u003cstrong\u003esystem normally for at least 15 minutes\u003c\/strong\u003e after dosing, since heat assists the sealing process.\u003c\/div\u003e\n      \u003c\/details\u003e\n      \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sentinel","offers":[{"title":"Default Title","offer_id":65283207299421,"sku":"ILS","price":13.35,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/SentinelLeakSealer1Litre-InternalWeepingJoint_PinholeLeakTreatment-ILS.jpg?v=1784308008","url":"https:\/\/qualityheating.co.uk\/products\/sentinel-leak-sealer-1-litre-internal-weeping-joint-pinhole-leak-treatment","provider":"AIZO Quality Heating","version":"1.0","type":"link"}