Specifications:Size: 12"36"Connection: RFRTJ Flange, Butt WeldedPressure Rating: Class 150LBClass 2500LBMaterial: A105, LF2, F11, F22, F5, F304, F316, F304L, F316L (12"2") Material: WCB, LCB, WC6, WC9, C12, C5, CF8, CF8M, CF3, CF3M, CF8C (2"36")Structural Features: Bolted Bonnet, Pressure Seal Bonnet, Single Disc, Double Disc.