Forespar Performance Products Full-Flow Seacock & 1/2" Mushroom Through-Hull Marelon. 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. Specifications for Forespar Performance Products Marelon Full-Flow Seacock & 1/2" Mushroom Through-Hull: Manufacturer: Forespar Performance Products Color: Black Features of Forespar Performance Products Marelon Full-Flow Seacock & 1/2" Mushroom Through-Hull 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 Package Contents: Forespar Performance Products Marelon Full-Flow Seacock & 1/2" Mushroom Through-Hull Forespar Performance Products 904042ABYC: Full-Flow Seacock & 1/2" Mushroom Through-Hull Marelon