This combination Pro Series filter and black anodized mount is approved by NHRA for use in top fuel dragsters and funny cars. The filter housing is permanently affixed to the mount and the element is accessed by removing the inspection cap. It comes with your choice of viton o-rings (gas or nitromethane) or buna o-rings (alcohol), SIZE #10 AND #12 fittings as well as a 35, 45 and 75 micron element choice. The mount has two 5/16-18 threaded holes on a 2” center.