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The INNOVA OHC Compression Tester Plus is designed to safely and easily access recessed spark plug holes to perform compression tests on vehicles with difficult access points, including SOHC (single overhead camshaft) and DOHC (dual overhead camshaft) applications. It features a side-release valve which allows repeated tests without disconnecting the hose. This tester includes a 15-inch high pressure hose with Stainless Steel casing, 14mm and 18mm adapters, 10mm and 12mm adapters which fit most motorcycles, ATVs, snowmobiles and watercraft. Also included is a 14mm long reach adapter for long reach spark plug applications and an 8-inch long reach adapter that can be used with any compression tester.