ASCO Mechanical and Electrical Gas Valves are ULC Classified and ULC Classified/CSA approved for use In Amerex, Ansul, Buckeye, Kidde, Pyrochem and Range Guard systems per NFPA 17 & 17A. The largest size available is 3". Note: All Electrical Gas Valves (except GVS75) must be mounted with the solenoid vertical and upright.