Innova 3612 Compression Tester - 4 Piece Kit. Model: 3612. Item model number: 3612. Manufacturer Part Number: 3612. OEM Part Number: 3612. It has a 15-in high-pressure rubber hose which is oil and grease resistant, a side-release valve which allows repeated tests without disconnecting the hose, and 14mm and 18mm adapters that fit most vehicles.