1. Threaded - Full Port - Blowout-Proof Stem - PTFE Seats 1/4" -2" 600 PSI/41.4 Bar Non-Shock Cold Working Pressure 2-1/2"-4" 400 PSI/27.6 Bar Non-Shock Cold Working Pressure 2. CSA: 1/4"-4" per ANSI Z21.15/CGA 9.1(1/2"psig) 1/4"-4" per ASME B16.44(5psig) 1/2"-2" per ASME B16.33(125psig) 3. UL: Guides YQNZ, YRBX, YRPV and YSDT 4. Size Range - 1/4" - 4"