Gasket Waste Tank Ninja Original Classic 13-1/2" OD X 10" ID X 3/8" thick sponge rubber Now the factory only ships 1/4" thick. OEM Associations: Prochem 8.619-990.0 8619900 Century 400 110-26A B42NB Esteam 475-031 repairs the following machine Century 400 Ninja Classic 11gal 500psi Dual 3 Stage Carpet Extractor Starter Package NJA500-05 . Factory collects elevated shipping charge from Canada!