The Stat-O-Seal washer is a thin flat washer that is bonded with a Buna-N inner seal, designed to make a seal around a threaded fitting. The thick rubber impregnation also seals between two mating surfaces when compressed.
The Stat-O-Seal washer is commonly used for sealing fuel taps to petrol tanks and also used behind the tachometer drive gearbox on Triumph twin engines. Also known as a “Dowty” washer, the Stat-O-Seal uses a thicker rubber seal and is considered an improvement over the original Dowty washer.
The washer is used directly between the tachometer drive gearbox and the crankcase exhaust cam aperture on Triumph twin engines, and also in conjunction with a flat thin washer on petcock threads to seal the junction between the petcock and petrol tank threads.
The washer is a snug fit on the threads and is generally threaded onto the threads of the fitting to obviate tearing the rubber impregnation from the metal washer.
We sell these sealing washers in a kit with flat washers. Please see “Related Products” below for more information.