SpeedFactory Racing Billet M28 TO -10AN Adapter Fittings were designed specifically for use on Honda/Acura engines to utilize the M28 threaded hole(s) on the back of the B-Series engine block for your aftermarket oil catch can/breather system, resulting in the proper crankcase ventilation your high performance engine needs.
These fittings can also be used In B-Series cylinder heads for dry-deck type cooling system setups where coolant is running through the cylinder head only (racing applications, see images).
-Full billet 6061 aluminum
-Precision CNC machined
-Utilizes factory crush washer for ease of installation