CLA-VAL Check Valve Cat # 81M-1IN-73888 Size 1" Mil-V-15508 FLOW CONTROL DEVICE DISK CONNECTION STYLE B21A STREAMLINED W/ONE BRAZING RING VALVE OPERATION METHOD AUTOMATIC CONNECTION TYPE UNTHREADED INTERNAL TUBE MOUNTING POSITION HORIZONTAL OR VERTICAL NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED 1.000 INCHES MATERIAL COPPER ALLOY 922 MATERIAL NICKEL ALLOY MATERIAL NICKEL ALLOY MATERIAL NICKEL ALLOY MATERIAL DOCUMENT AND CLASSIFICATION QQ-C-390, ALLOY D4/D FED SPEC SINGLE MATERIAL RESPONSE MATERIAL DOCUMENT AND CLASSIFICATION QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STYLE DESIGNATOR A2 STRAIGHT THRU CLA-VAL Co.