BrassCraft's Coated Corrugated Steel Tankless Installation Kit contains everything you need to connect most tankless water heaters to your gas and water supply. Tankless Service Valve features a captive nut and washer to eliminate the potential for component loss during installation. Additionally, the captive washer won't kink or misalign during installation. The new compact, slim-fit valve design is a perfect fit for a variety of installations - recessed or cover boxes. Integrated drain valve allows instant.