Marelon Full-Flow Seacock & 1-1/2' Mushroom Through-Hull This integrated 2-part system comes complete with a Marelon® 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