K65 brazed fittings, developed in conjunction with Wieland, enable the simple, safe and economical installation of high pressure refrigeration applications up to 130 bar.  The range is particularly suited for use with CO2 (R-744) in transcritical applications as the K65 alloy provides a mechanical strength high enough to withstand the pressure ratings required. 

Benefits summary

UL recognised component with a maximum operating pressure of 130 bar 
Easy to identify - even after installation due to clear marking
Corrosion resistant
Component materials
Wieland K65, EN CuFe2P CW107C, UNS C19400 


High pressure air-conditioning
High pressure refrigeration
Operating parameters of 130 bar at operating temperatures of up to 150°C


VdTÜV material sheet 567, seamless drawn tubes in CuFe2P (CW107C) Wieland K65
EN 12449 seamless, round tubes for general purposes
EN 12735-1 copper and copper alloys, seamless, round copper tubes for air-conditioning and refrigeration
Wieland R-H-1600 tubes for high pressure systems 130 bar (K65)
ISO 5149-2, EN378-2 strength pressure test, compliant
EN 14276-2 - type burst proof test, compliant
Tubes UL 207 component file number SA44215
Fittings UL 207 component file number SA44293


From 3/8" to 2 1/8"


When professionally installed, used and maintained in accordance with K65 installation instructions, Conex Universal Ltd. guarantees that K65 fittings supplied by Conex Universal Ltd. will be free of material defects resulting from errors in manufacture, for twenty-five (25) years from the date of first purchase by an end user.  For full terms and conditions please refer to the Product Guarantee Statement