This is a M12 x 1.25, M18 x 1.50 thread adapter with quick
disconnect. This adapter
screws into the head of the engine in the glow plug hole. This is made
to be used on Audi, BMW, Deutz, Lincoln, Mercedes-Benz, Peugeot, VW and more. This is made
to be used with ATC4451 compression
gauge with
hose.
