INNOVA 3615 OHC Compression Tester Plus - 7 Piece Kit Designed to access recessed spark plug holes to perform compression tests on vehicles with difficult access points Side-release valve allows repeated tests without disconnecting the hose Includes 15-inch high pressure hose with stainless steel casing, 10mm, 12mm, 14mm, and 18mm adapters Includes 14mm long reach adapter for long reach spark plug applications Also includes 8-inch long reach adapter that can be used with any compression tester