The Lang Aquapres is a hydraulic pressure curing unit designed for use with self-curing resins. Eliminates porosity in methacrylate acrylics and provides long-lasting color stable results. Works without heat, electricity or compressed air. Maintenance free and easy-touse. Simply fill unit with tap water, place models in unit, replace top and turn handle to desired pressure. Optimum effective pressure is 30 lbs. Holds pressure for hours at a time. 2-year unconditional guarantee. Stainless steel frame and plastic bowl. Overall dimensions: 9"Hx6.5"Wx5.25"L. Inside diameter is 5" and inside height is 3.5".