"BRASS BALL THREADED VALVE150 PSI WSP steam. 600 PSI Non-shock WOG ( 1/4 through 3 ) CSA 3-88 (5 PSIG) Certified (1/4 through 2) CSA Z21-15a-90 (1/2 PSIG) Certified (2 1/2 , 3) CSA tamper proof (T) (1/2 through 2) UL- L.P. Gas 400 PSI. Suitanle for vacuum use up to 7 PSI. Suitable for use with flammable liquid (1/2 through 2 IPS) Patented Teflon¨ seat design reduces friction. Dacromet plated handles will not rust. Vibration proof handle nut remains tight in difficult application such as on air compressors and machinery."