INNOVA 3613 OHC Compression Tester - 5 Piece Kit Designed 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 rubber hose with 12mm, 14mm and 18mm adapters Also Includes 8-inch long reach adapter that can be used with any compression tester Large, easy-to-read 2-1/2-inch dial face with dual-calibrated and color-coded scales