Draper Expert Petrol and Diesel Master Engine Compression Test Kit (42 Piece)

The Complete Workshop Compression Testing Solution

When your workshop sees everything from motorcycles and family cars to light commercial vans and marine outboards, a single-application compression tester simply isn't enough. The Draper Expert CTED2-E Master Compression Test Kit is built for exactly this challenge — a comprehensive 42-piece set that delivers professional-grade compression testing across virtually any petrol or diesel engine you're likely to encounter.

With an extensive adaptor collection covering the widest range of spark plug and glow plug thread specifications, this is the compression test kit you reach for when you don't know what's coming through the workshop door next.

Large Dual-Reading Gauge with Heavy Duty Protection

The centrepiece of the kit is a large dual-reading pressure gauge calibrated from 0–600psi and 0–40bar, sized generously for clear, accurate readings across both scales simultaneously. Whether your workshop data specifies compression figures in psi or bar, the dual-scale face eliminates manual unit conversion and the errors that come with it.

The gauge is fitted with a heavy duty rubber protector — an essential feature on a kit that will see regular, demanding workshop use. Knocks, drops and the general rigours of a busy workshop floor are all part of daily life; the rubber surround absorbs the impact and keeps the precision instrument inside functioning accurately.

Anti-Kink Hose for Long-Term Reliability

The flexible hose connecting the gauge to the engine features anti-kink coils at both ends — precisely where stress, bending and fatigue most commonly cause failure in unprotected hoses. These coils maintain the hose's integrity at its most vulnerable points, preventing internal restrictions that could distort readings and extending the working life of the tool considerably.

Accurate and Safe Valve System

Two integrated valve systems work together to ensure every compression reading is both accurate and safely managed. The Schrader one-way valve holds peak cylinder pressure at the gauge between each compression stroke, stabilising the needle for a clean, readable maximum figure. The spring-loaded pressure relief valve then allows that accumulated pressure to be safely bled off after testing — avoiding the sudden, uncontrolled release of compressed air that would otherwise occur when unscrewing the adaptor from a pressurised bore.

Together, these features make the CTED2-E as safe to use as it is accurate.

42-Piece Adaptor Set — Unmatched Compatibility

What truly sets the CTED2-E apart is the sheer breadth of its adaptor collection. With 42 pieces covering petrol and diesel engines across motorcycles, cars, light vans and marine applications, it's one of the most comprehensive compression test kits available at this level. The full contents include:

• 1 x Dual reading pressure gauge
• 1 x Universal adaptor with sleeve
• 1 x Right-angled hose adaptor
• 1 x Non-threaded glow plug adaptor
• 3 x Petrol adaptors — M10, M12, M18mm
• 3 x Clamping brackets
• 4 x Large dummy glow plugs
• 5 x Adaptor sleeves
• 22 x Dummy glow plugs (various sizes)
• 1 x Assorted sealing washers

The M10, M12 and M18 petrol adaptors cover the full range of spark plug thread sizes found in modern and classic petrol engines. The extensive collection of 22 dummy glow plugs alongside 4 large dummy glow plugs ensures broad diesel compatibility across motorcycle, car and light commercial applications. The right-angled hose adaptor provides access to glow plug bores that are awkwardly positioned or partially obstructed by surrounding engine components — an increasingly common challenge on modern engines.

Organised and Protected in a Carry Case

With 42 individual components, organisation is everything. The kit is supplied in a fitted plastic storage case that keeps every adaptor, sleeve, washer and bracket in its designated place — making it easy to locate the right fitting quickly and ensuring nothing goes missing between jobs. The case also protects the gauge and components during transport and storage.

Key Features & Benefits

• Petrol and diesel compatibility — A single kit covering both fuel types across a wide range of vehicle and engine types
• Motorcycles, cars, LCVs and marine engines — True multi-application versatility
• 0–600psi / 0–40bar dual reading gauge — Simultaneous dual scales; no unit conversion needed
• Large gauge face — Clear, precise readings in all workshop conditions
• Heavy duty rubber gauge protector — Daily workshop durability
• Anti-kink coils at both hose ends — Extended hose life and consistent sealing
• Schrader one-way valve — Stable, accurate peak compression readings
• Spring-loaded pressure relief valve — Safe, controlled pressure release after testing
• 22 dummy glow plugs plus 4 large — Exceptional diesel engine coverage
• M10, M12 and M18 petrol adaptors — Full spark plug thread size coverage
• Right-angled hose adaptor — Access for restricted or obstructed plug locations
• 42 pieces in a fitted carry case — Complete, organised and always ready

Who Is It For?

The Draper Expert CTED2-E is the ideal choice for independent garages, multi-franchise workshops and mobile mechanics who work across a diverse range of vehicle types and engine specifications. Its combined petrol and diesel capability, extensive adaptor range and robust construction make it particularly well suited to workshops that handle everything from small motorcycle engines to marine outboards and light commercial vans — without wanting to invest in multiple single-application kits.

It's also a compelling choice for enthusiastic home mechanics and classic car restorers who need a comprehensive, professional-quality tool that covers both older and modern engine specifications.

Technical Specifications

• 42-piece master compression test kit covering petrol and diesel engines
• Compatible with motorcycles, cars, light commercial vehicles and marine engines
• Large dual-reading gauge 0–600psi / 0–40bar with heavy duty rubber protector
• Anti-kink coils at both ends of flexible hose for durability and consistent sealing
• Schrader one-way valve holds peak pressure; spring-loaded relief valve for safe release
• Includes M10, M12 and M18 petrol adaptors for full spark plug thread coverage
• 22 standard plus 4 large dummy glow plugs for extensive diesel engine compatibility
• Right-angled adaptor for restricted or obstructed plug access
• All 42 pieces supplied in a fitted plastic storage case
• Product Code: CTED2-E | Brand: Draper Expert

Q: Does this kit cover both petrol and diesel engines? Yes. The CTED2-E includes petrol adaptors in M10, M12 and M18mm thread sizes covering the full range of spark plug specifications, alongside an extensive collection of 22 standard and 4 large dummy glow plug adaptors for diesel engines — making it a true dual-fuel compression testing solution.

Q: What types of vehicles is this kit compatible with? The kit is designed for use on most motorcycles, cars, light commercial vehicles and marine engines. The 42-piece adaptor set is specifically chosen to maximise compatibility across this broad range of applications, covering the wide variety of plug thread specifications found across different manufacturers, engine sizes and eras.

Q: How is this different from the Draper CTED1-E commercial vehicle kit? The CTED1-E is a 13-piece kit focused specifically on commercial vehicle diesel engines, with a higher pressure range of 0–1000psi/70bar to reflect the greater compression ratios found in heavy-duty diesel engines. The CTED2-E is a broader 42-piece master kit covering petrol and diesel across a wider range of vehicle types — including motorcycles and marine engines — with a 0–600psi/40bar range suited to lighter engines.

Q: What does the Schrader one-way valve do? The Schrader one-way valve retains peak cylinder pressure at the gauge between each compression stroke, preventing the needle from dropping back between firings. This stabilises the display and gives you an accurate, readable maximum compression figure that can be reliably compared across all cylinders.

Q: Why are there so many dummy glow plugs included? Diesel engines across different manufacturers use varying glow plug thread sizes and configurations. The 26 glow plug adaptors in this kit — 22 standard and 4 large — are selected to cover the widest possible range of diesel engine specifications across motorcycles, cars, vans and marine applications, reducing the likelihood of encountering an engine the kit cannot test.

Q: Is the right-angled adaptor necessary? On many modern engines, glow plug access is partially obstructed by surrounding components such as fuel rails, injector lines or engine covers. The right-angled hose adaptor allows the flexible hose to exit the glow plug bore at 90 degrees, providing the clearance needed to connect the gauge where a straight adaptor simply won't fit.

Q: Is this kit suitable for classic or older vehicles? Yes. The inclusion of M10, M12 and M18 petrol adaptors and a wide range of glow plug sizes means the kit covers both older and modern engine specifications — making it a strong choice for classic car restorers and enthusiasts working with vintage petrol or diesel engines alongside more modern vehicles.