Flanged Seacock, 1", Brass. Series FSC Watts Marine Full Flow Flanged Seacocks are UL Marine approved and manufactured from 85-5-5-5 naval bronze. Triangular flanged, machined smooth for flush fit hull mounting. Full flow design assures no restriction of flow. These valves feature heavy duty stainless steel handle and hardware for the best corrosion resistance. All valves are pressure rated to 600psi (41 bar) and incorporate PTFE stem packing seals & seats and are 100% tested in both the open and closed position.