Replaceable Acetal seat and straight through porting for bidirectional, high capacity flow and easy roddable cleaning.187" Orifice, PTFE Packing 100% helium leak tested to 1 x 10-4 ml/s for guaranteed performance and reliability.Block & Bleed Valve, Soft Seat, 1/2 NPT Male - 1/2 NPT Female, Steel, 0..