The RLS 399021151080 is a precision‑engineered 1/2" press jaw built for Klauke 15 kN compact press tools and fully compatible with RLS copper HVAC/R press fittings. Manufactured from hardened steel, the jaw delivers consistent, repeatable crimps that meet the performance requirements of modern refrigeration systems — including high‑pressure ACR lines.

Its compact profile allows technicians to work in tight spaces such as rooftops, mechanical rooms, and crowded line‑set runs. When paired with RLS fittings, the jaw produces a permanent, leak‑resistant connection in seconds, eliminating the need for nitrogen purging, open flames, or post‑braze cleanup. This makes it ideal for residential, commercial, and light industrial HVAC/R installations.

The jaw is part of the RLS flame‑free press system, which is widely adopted for its speed, safety, and reliability across the HVAC/R industry.