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).Features:-Full billet 6061 aluminum-Precision CNC machined-Utilizes factory crush washer for ease of installation For the ultimate crankcase breather setup, pair these fittings with a SpeedFactory Billet B-Series Breather Port Plug(see images) to block off the OEM "black box" breather port.  

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