Made of virgin high density polyethylene conforming to ASTM D1248 for polyolefin materials. Neutralization tanks are designed to receive, dilute, and neutralize corrosive and harmful chemical wastes before allowing such material to be discharged into the public sewers or the environment. Tanks are seamless with uniform wall thickness and are free of stresses. Can be used for service at 180°F in continuous service, or intermittent use of 212°F. Limestone chips are being used in numerous applications to help neutralize chemical bearing wastes. Installation kit includes the following: inlet and outlet adapter, and a sink outlet. Red cap screws off for easy cleaning. It is recommended that the limestone chips be one to three inches in diameter size range and have a calcium carbonate content in excess of 90%. See above chart for recommended limestone usage. Tank has a 6 gallon overall capacity, 4.3 useable capacity. 1.5" MNPT inlet/outlet. Overall height 18.5" Diameter w/o fittings 11".