22 mm inside diameter exhaust gasket for gas scooters, typically 50cc engine size but may be compatible with some models of 125cc-150cc engines Compatible with a variety of machines, including ATVs, dirt bikes, go-karts, and gas scooters.Description 22 mm inside diameter exhaust gasket for gas scooters, typically 50cc engine size but may be compatible with some models of 125cc-150cc engines.Compatible with a variety of machines, including ATVs, dirt bikes, go-karts, and gas scooters. ? WARNING California Residents: Proposition 65 Warning Specifications Center Hole Diameter: 22 mmMounting Hole Diameter: 6.5 mmMounting Hole Distance: 45 mm