Sealey vs200 petrol engine compression tester sealey vs200 large 56mm gauge fitted with protective cover and 440mm hose scale reads from 0 25bar 0 350psi and conforms to bs 1780 1985 suitable for petrol engines with 10 12 14 or 18mm spark plugs also includes 445mm hose and quick release connector for air input supplied in carry case sealey vs200 petrol engine compression tester