Marelon Full-Flow Seacock & 1/2" Mushroom Through-HullThis integrated 2-part system comes complete with a MarelonA(R) valve and properly matched mushroom head thru-hull with super strong "buttress" type threading. This new package is designed to eliminate valve and thru-hull thread style mismatches and associated cross-threading for after market installations common when customers select individual parts from bins.Features: System Includes Full Flow Seacock With Integrated Hose Connector and Mushroom Thru Hull Exceeds ABYC. H-27 Standards - UL Approved For Use Above or Below Waterline Never Corrodes - Exclusive Polymer Formulation Includes Emergency Handle Cap Thru-Hull Plug