Valve can be locked in the closed position by reversing the handle. Double Viton o-rings meets the NFRA58 Dialectic requirement. 100% leak tested and. Leakproof stem. UL listed, CSA certified ANSI B1.20.1, MSS SP-110 and Value seat rating 600 WOG.Valve can be locked in the closed position by reversing the handleDouble Viton O-ringsMeets the NFRA58 dialectic requirement100% leak testedLeakproof stem. UL ListedCSA certified ANSI B1.20.1MSS SP-110Value seat rating 600 WOG must be installed by trained personnel in accordance with NFPA 58 and 54 state and local codes. Warning- This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go towww.P65Warnings.ca.gov