ProVac Swivel Wheel Commercial Vacuum Head - 19 Inch - 2 Inch width_2 Inches They attach to the underside

They attach to the underside of the diving board

This model does not include wheels

Smith MultiLift

So if replacing the curved rail from one side of a Durafirm Stand

and 1/4 inch ferrule

ProVac Swivel Wheel Commercial Vacuum Head - 19 Inch - 2 Inch width_2 Inches They attach to the undersideThe ProVac Swivel Wheel Commercial Vacuum Head measures 19 inches and will accommodate a 2 inch hose directly on the vac head. It does include a swivel adapter that allows you to use a 1 1 2 inch hose if needed. The swivel adapter allows the hose to move freely without twisting. The Swivel Vacuum Head by Pentair is constructed of ABS and polyethylene with 6 fully enclosed lead weights. The adjustable polyurethane wheels swivel in any direction. The