An adapter hose that allows you to conveniently reach the #3 and #4 cylinders of RV6 and RV7 airplane engines.

The close engine mount of the RV6 and RV7 airplanes sometimes makes it difficult to get a standard adapter in place to do compression testing because there is simply not enough clearance between the engine and the baffle. This adapter solves the problem in a simple elegant way. Simply screw the 18mm end into the spark plug port while taking advantage of the hose's flexibility to clear the baffle, then connect to our Differential Pressure Tester and test the cylinder as you normally would.