Flex Drive Compression Tester

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This flex-drive compression tester features an air-hold valve and a gauge reset button. Tests up to 300 PSI. Checks cylinder compression from 0 PSI to 300 PSI (0 to 21kg/cm2). Fits 14mm & 18mm spark plug threads. Equipped with air-hold valve and gauge reset button. 11" flexible rubber hose. Complete instructions included. Show more