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 
Suitable for operating pressures up to 130 bar
Easy to identify - even after installation due to clear marking
High mechanical strength
Corrosion resistant

Component materials

Wieland K65, EN CuFe2P CW107C, UNS C19400


High pressure air-conditioning
High pressure refrigeration

Operating parameters

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"

For further information please refer to our Technical Brochure.


For Conex Bänninger, product quality has top priority!

When professionally installed, used and maintained in accordance with the installation and maintenance instructions detailed in the technical brochure, Conex Universal Ltd. guarantees that all products as supplied by Conex Universal Ltd. will be free of material defects resulting from errors in manufacture.

The warranty offered by Conex Bänninger corresponds to the national laws and standards of the origin country of purchase. Conex Bänninger is not liable for the incorrect or inappropriate use of the Goods. Please also refer to our terms and conditions.