The Lawton ACR copper straight coupling (C x C) joins two lengths of refrigeration-grade copper tube with a brazed capillary joint. It is a seamless, one-piece fitting made to ASME B16.22, which makes it strong and easy to use, and it is cleaned for air conditioning and refrigeration (ACR) service.
Use it to repair or extend soft copper coil on split air conditioning pipework, or wherever two tube ends need a permanent brazed connection. Available in 1/4", 3/8", 1/2", 5/8" and 3/4" sizes, with working pressures of 90 to 150 bar up to 100 °C and compatibility with R32, R410A and other common refrigerants.
1/4" to 3/4"
Five fitting sizes
ASME B16.22
Manufacturing standard
90 to 150 bar
MWP up to 100 °C
Seamless
One-piece construction
⚠ F-Gas certified engineers only
Brazing and pressure testing on refrigerant pipework must be carried out by suitably F-Gas certified engineers. Flow oxygen-free nitrogen through the pipe while brazing.
⚠ Brazed fittings are not for pressing
These are capillary fittings for brazing. They are not interchangeable with MaxiPro press fittings, and brazing close to an existing pressed joint can damage its seal.
ℹ Part codes
Lawton part codes are RFCP14 (1/4"), RFCP38 (3/8"), RFCP12 (1/2"), RFCP58 (5/8") and RFCP34 (3/4").
Key features
🧱
Seamless one-piece
Seamless, one-piece construction makes the fitting stronger and easier to use than fabricated joints.
🧼
Clean for ACR
Clean, smooth inner surface with carbon content of 0.38 mg/dm² or less, suited to refrigeration and air conditioning circuits.
💪
High pressure ratings
Burst pressure from 280 bar (3/4") up to 500 bar (1/4"), with a safety factor of at least 3 applied to the working pressure.
🔥
Brazed joint
Soldering and brazing jointing with electrical continuity maintained across the joint.
🔎
Traceable marking
Permanent marking with the Lawton logo and size on each fitting.
🛡️
75-year warranty
75-year warranty from Lawton, subject to its standard terms and conditions.
Technical specification
Fitting
Type
Straight coupling, copper x copper (C x C)
Material and build
Material
CW024A copper, 99.90 % copper content (including silver)
Construction
Seamless, one-piece, end-feed capillary fitting
Jointing method
Soldering or brazing
Electrical continuity
Yes
Inner surface quality
Clean and smooth, carbon content ≤ 0.38 mg/dm²
Marking
Permanent marking with Lawton logo and size
Pressure Equipment Directive
Compliant component for PED assemblies
Warranty
75 years, subject to Lawton's standard terms and conditions
Compatible refrigerants
Refrigerants
R32, R134a, R410A, R404A, R407C, R407F, R1234yf, R1234ze, R744 (CO₂) and other common refrigerants
Available sizes and maximum working pressures
Size
Lawton part code
Burst pressure
MWP up to 55 °C and 100 °C
MWP up to 150 °C
1/4"
RFCP14
500 bar
150 bar
131 bar
3/8"
RFCP38
360 bar
120 bar
105 bar
1/2"
RFCP12
320 bar
100 bar
87 bar
5/8"
RFCP58
300 bar
100 bar
87 bar
3/4"
RFCP34
280 bar
90 bar
79 bar
Frequently asked questions
What is the difference between this and a MaxiPro press coupler?
This is a capillary fitting joined by brazing, using heat and filler alloy. A MaxiPro coupler is a mechanical press fitting made with a press tool and needs no flame or nitrogen purge.
Which tube does it fit?
It fits ACR copper tube of the same nominal outside diameter, such as 1/4", 3/8", 1/2", 5/8" and 3/4" ACR tube to EN 12735-1.
Do I need nitrogen when brazing?
Yes. Purge the pipe with oxygen-free nitrogen while brazing to prevent oxide scale forming inside the tube.
Is it suitable for R32 and R410A?
Lawton lists R32, R410A, R134a, R404A, R407C, R407F, R1234yf, R1234ze and R744 among the refrigerants its ACR fittings suit. Always check the system design pressure and unit manufacturer's instructions.
Does it meet pressure equipment requirements?
Lawton describes its ACR capillary fittings as compliant components for assemblies subject to the Pressure Equipment Directive.
