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Check the listing for details. Mityvac MV5530 Engine Compression Test Kit, Manual Pressure Release, 2-3/4 in. B. Condition: New. Listed at 90.43 USD. Mityvac MV5530 is a comprehensive kit that includes everything required to perform dry or wet compression tests on gasoline / petrol engines. Compression testing is commonly used to detect problems with rings, cylinder heads, sticking valves, failed head gaskets and more.