Cal-Van - Allstart 390-200 Replacement Rubber Stopper for Cylinder Leak Detector

The Cal-Van - Allstart 390-200 is a replacement rubber stopper designed for use with the Cal-Van 389FCC cylinder leak detector. This essential component is used to verify that engine valves are closed before performing critical engine repair work such as spark plug thread repairs.

Key Features:

• Replacement rubber stopper for Cal-Van 389FCC leak detector tool
• Inserts into spark plug hole and pops out under air pressure when valves are closed
• Helps prevent valve damage during drilling and tapping operations
• Saves time compared to removing valve covers to check cam lobe position
• Durable rubber construction for reliable sealing

This stopper is particularly useful when working on Ford spark plug thread repairs and other cylinder head work where proper valve positioning is critical. When connected to a low-pressure air supply, the rubber cone will pop out of the spark plug hole when both intake and exhaust valves are fully closed, providing a quick and reliable confirmation before beginning repair procedures.