Compatible Refrigerant List

A1134A404A407A407B407C407F
A1407G407H410A417A421A422A
A1422B422C422D424A427A434A
A1437A438A448A449A449B449C
A1450A452A452C453A456A507A
A1513A513B718Ethylene Glycol22*
A2L32143A444A444B445A446A
A2L447A447B451A451B452B454A
A2L454B454C455A457A1234yf1234ze
A3290600600A601601A

RLS press fittings and seals are compatible with the above refrigerants. Refrigerant compliance varies by region and/or jurisdiction, so consult your local codes and standards to ensure RLS press fittings are compliant with your fluid.
*Special order item. Chlorinated fluid requires a Neoprene seal (o-ring) in place of HNBR. Minimal product offering available.
RLS fittings are also compatible with the following industrial (non-refrigerant) gasses: nitrogen, argon, helium and oxygen (non-medical).
Infographic illustrating the transition to flammable refrigerants in the HVAC/R industry, featuring RLS's flame-free press technology, compliance standards, transparency initiatives, and FAQ addressing common concerns. Includes sections on understanding the shift, leading solutions, compliance standards, transparency, FAQ, and ongoing initiatives for a sustainable future.

Ensuring Compliance and Safety: RLS Press Fittings and Flammable Refrigerants

RLS rigorously adheres to the UL 207 standard, ensuring press fittings meet safety and performance benchmarks for flammable refrigerants like A2L and A3 fluids. This standard has been recently updated to include additional testing requirements for ACR press fittings.

RLS ensures its press fittings meet crucial safety and performance benchmarks for flammable refrigerants by rigorously adhering to testing protocols. RLS press fitting components are compatible with flammable fluids, but certification for flammable use is expected by early 2024.

*When using A2L, A2, and A3 refrigerants, consider specific standards and local regulations that may apply.