A disposable canister, lid, mesh filter and gasket designed to replace the present canister and filter in your central vacuum pump. Fits: Apollo: 2 HP, 3 HP Single and Tandem Air Techniques: 1997 and later dual models; Vacudent-Workhorse Dual, VacStar newer models. Fine mesh screen. Measurements: 3 1/2 in x 4 3/8 in