Whitehall Whirlpools All tanks feature 1/2 horsepower turbine motor, heavy gauge stainless steel construction, seamless covered bottoms to minimize bacterial build-up, and a dual scale thermometer. Lead free. Stationary units require permanent installation and come with 2" drain and overflow assembly. Mobile units have large wheels and drainage and filler hoses. All units ship freight. Hi-Boy Whirlpools offer complete coverage to the back, hip and shoulder areas. If full immersion is not desired, use the optional Adjustable Suspension Seat (Item #3177). Use with optional Tank Top Seat (#3182) sold separately for lower extremity treatments.