• Use with the Model No's VS160 or VS168 to hold the valves closed whilst spring is compressed.• Spark plug adaptor with M14 and M18 threaded fittings for car and light commercial use.• Valve assembly maintains cylinder pressure when air supply is cut.• Requires a 90-125psi supply.• Requires standard bayonet air line coupling (not included).Use with the Model No's VS160 or VS168 to hold the valves closed whilst spring is compressed. Spark plug adaptor with M14 and M18 threaded fittings for car and light commercial use. Valve assembly maintains cylinder pressure when air supply is cut. Requires a 90-125psi supply. Requires standard bayonet air line coupling (not included).• Use with the Model No's VS160 or VS168 to hold the valves closed whilst spring is compressed. • Spark plug adaptor with M14 and M18 threaded fittings for car and light commercial use. • Valve assembly maintains cylinder pressure when air supply is cut. • Requires a 90-125psi supply. • Requires standard bayonet air li