OTC Deluxe Compression Tester Kit for Petrol Engines — 5605, Dual-Scale Gauge & 25" Flex Hose

OTC 5605 Deluxe Compression Tester Kit is a ready-to-use compression testing set for gasoline engines that includes multiple specialty adapters, a long flex hose and a dual-scale gauge for fast, reliable readings.

This full-service kit supplies the fittings and hardware most shops need to check cylinder compression on a wide range of gasoline engines. Every metal part is nickel-plated to resist corrosion, and the 2-1/2" dual-scale gauge displays pressures in psi and kPa. The kit is housed in a blow-molded hard case so components stay organized between jobs.

What adapters are included and which engines do they fit?

The 5605 ships with a mix of standard and specialty adapters to cover common spark plug threads and recessed plug wells. Included connectors are sized to accommodate flat and tapered seats plus the Ford Triton 16 mm application. These pieces let you test many late-model and older gasoline engines without searching for extra fittings.

• 8" deep-well 14 mm connector for recessed plug wells
• 5" flex Ford Triton 16 mm adapter for Triton-style plugs
• Two 12" flex 14 mm reach adapters (standard and long)
• Thread adapters: 10 mm, 12 mm and 18 mm

How easy is it to read and use the gauge in tight engine bays?

The gauge assembly includes a 25" extra-long flexible hose and quick coupler so you can position the dial for clear viewing even in crowded engine compartments. The 2-1/2" dial has a chrome bezel and a rugged protective boot to resist shop wear. The dual-scale face shows 0–300 psi and 0–2100 kPa for quick interpretation.

• 25" flex hose for remote dial placement
• Quick coupler for fast hook-up and removal
• Protective outer boot guards the gauge against impacts
• Dual scales in psi and kPa for universal readings

What materials and construction features improve durability?

All metal adapters and fittings have a corrosion-resistant nickel-plated finish that extends service life in shop environments. The gauge’s bezel and boot add physical protection, while the blow-molded hard case keeps components secure during transport and storage. A small repair parts kit is included to address routine service items quickly.

• Nickel-plated metal components resist rust
• Rugged gauge bezel and protective boot
• Blow-molded hard case with removable lid for neat storage
• Included repair parts kit for common maintenance

How do I know this kit offers good shop value?

OTC positions the 5605 as a practical, full-featured compression tester that handles most gasoline engine diagnostics without requiring extra purchases. The combination of specialty adapters, long hose, dual-scale gauge and a hard case reduces downtime and keeps the tool ready when you need it. That mix of features is intended to raise technician efficiency and lower the need for accessory buys.

• Comprehensive adapter assortment minimizes add-on purchases
• Durable finish and case lower replacement frequency
• Long hose and protective gauge speed workflow on busy benches

Who is this for: The OTC 5605 Deluxe Compression Tester Kit is designed for independent mechanics, shop technicians and serious DIYers who service gasoline engines and need a single, organized kit that covers both common and specialty spark plug fittings. It’s ideal for anyone who wants a robust, long-reach gauge package with adapters for recessed wells and Triton-style plugs, stored in a durable case for everyday shop use.