Description Features: Compatible with direct and indirect petrol engines which use 14 and 18mm spark plug threads. The dual reading pressure gauge 0-300psi/0-20BAR is fitted with a heavy duty rubber protector. Fitted with a spring-loaded pressure relief valve and integrated Schrader one-way valve system. Supplied in a plastic storage case. Contents:    63mm Diameter gauge    280mm Flexible hose    Adaptor