OTC Deluxe Compression Tester Kit for Gasoline Engines — 25" Flex Hose, Dual-Scale 0–300 psi Gauge

The OTC 5605 Deluxe Compression Tester Kit is a complete, professional-grade set for checking gasoline engine cylinder compression with multiple adapters, a long flex hose and a dual-scale 0–300 psi gauge.

This all-in-one kit gives technicians and home mechanics the adapters and hardware needed to test a wide variety of gasoline engines — including recessed plug wells and Ford Triton applications — while keeping parts organized in a rugged blow-molded case. Metal parts are nickel-plated for corrosion resistance and the kit pairs a 2-1/2" chrome-bezel gauge with a 25" flexible hose so readings are easy to view even in tight engine bays.

How does the OTC 5605 adapt to different spark plug types?

The kit includes a selection of standard and specialty adapters so you can fit both flat and tapered seat plugs. It covers common sizes and hard-to-reach recessed wells, plus a dedicated adapter for Ford Triton 16 mm plug threads.

• Adapters fit flat and tapered plug seats for broad compatibility
• 8" deep-well 14 mm connector for recessed plug wells
• Ford Triton 16 mm adapter for Triton-style heads
• Additional 10 mm, 12 mm and 18 mm thread adapters for common engines

What features make this kit easy to use in crowded engine compartments?

An extra-long 25" flexible hose and a quick-connect coupler let you position the gauge away from obstructions so readings are visible without awkward contortions. The rugged outer boot protects the 2-1/2" gauge during shop use while the chrome bezel improves readability.

• 25" flex hose for reach and convenient viewing
• Quick coupler for fast attachment and removal of the gauge
• Dual scale gauge (0–300 psi and 0–2100 kPa) for standard or metric readouts
• Protective outer boot guards the gauge against drops and shop hazards

What’s included in the kit and how are the pieces protected when stored?

The kit ships with multiple thread adapters, two lengths of 14 mm flex reach, a deep-well connector, the Ford Triton adapter, and a small repair parts kit. All components are stored in a durable blow-molded hard case with a removable lid to keep parts organized and protected between uses.

• 12" flex 14 mm standard and 12" flex 14 mm long reach adapters for varied access
• 5" flex Ford Triton 16 mm adapter and 8" deep-well 14 mm connector
• 10 mm, 12 mm, and 18 mm thread adapters included
• Repair parts kit and blow-molded hard case with removable lid

Who is this for: The OTC 5605 Deluxe Compression Tester Kit is designed for professional technicians, independent repair shops and advanced DIYers who need a robust, flexible compression testing solution for gasoline engines. If you service multiple vehicle makes or encounter recessed plug wells and Triton-style plugs, this kit supplies the adapters and durable gauge assembly to diagnose compression issues efficiently while protecting components in a hard case.