Complete Head Gasket Kit - KTM/Husky/GasGas 125cc TBI & Carb Models When installing a new TSP CNC machined billet head, we highly recommend using all new o-ring seals and copper crush washers. This complete head gasket kit includes both inner and outer cylinder head o-rings, 1 TSP insert oring, 1 water temp sensor o-ring (when applicable), and 6 copper crush washers for the head bolts. Everything you need to properly install your new TSP cylinder head. KTM / Husky / GasGas 125 Complete Head Gasket Kit. Includes: 1 x Inner O-Ring 1 x Outer O-Ring 1 x TSP Insert O-Ring 1 x H2O Temp Sensor O-Ring (model specific) 6 x Copper Crush Washers We have sourced the highest quality VITON o-ring material designed to withstand all engine compartment chemicals like gasoline, oil ,and engine coolant. VITON o-rings also have the highest heat range temperatures of any other o-ring material, allowing them to continue to function at temps exceeding 400 degrees Fahrenheit. VITON o-rings meet the manufactures recommended specifications for o-ring material. Please be sure to specify your make/model/year in the Model Validator to ensure proper fitment.