Reservoir tank 50033182-001 for the TrueSteam HM506 series. Includes quarter turn petcock drain valve and latch (the red handle latch), see our photos. Tank sediment screen (50024895-001) and tank gasket (50051144-001) is included. This tank holds 4 lbs of water when used with the HM506 series. See installation manual, page 22 for specifications.