Seaview POP Display Box w/12-Pack Vault Drain Plugs (SV101V) [SV101VPOP]POP Display Box with 12 Pack Vault Drain Plugs (SV101V) The Vault series drain plug is engineered to screw right into the existing 1 2 NPT brass or stainless transom garboard. Features: Triangular ergonomic cap so there are no tools required to tighten or loosen the plug NPT backup O ring for a water tight fit The matching garboard utilizes a gasket in place of messy silicone Approved for all marine environments including saltwater Fits all 1 2 NPT