The Pico standard compression hose (not supplied with individual adaptors) must be used in conjunction with the appropriate adaptor for carrying out Engine Compression tests with the WPS500X.
Adaptors are available for the following spark plug thread sizes
M10 short reach (1.0 mm pitch)
M10 deep reach (1.0 mm pitch)
M12 deep reach (1.25 mm pitch)
M14 short reach (1.25 mm pitch)
M14 deep reach (1.25 mm pitch)
M16 for Ford triton style engines (1.5 mm pitch)
M18 for older engines (1.5 mm pitch)
Please ensure that the adaptor you select is the same thread size and no longer than the tip of spark plug you are replacing. While using a shorter adaptor than the spark plug you are replacing may produce results that are slightly low using one that is longer may damage your engine.