Listing is for one NEXEN AIR OPERATED CLUTCH/BRAKE #(824307). THEY HAVE ALL BEEN REFURBISHED WITH NEW CLUTCH DISC AND BEARINGS.  WE HAVE SEVERAL OF THESE, A FEW MIGHT BE MISSING THERE TAGS, BUT THEY ARE ALL IN LIKE NEW CONDITION. The air port is 1/4"NPT. IF ANYONE HAS ANY QUESTIONS REGARDING THIS ITEM PLEASE FEEL FREE TO MESSAGE US. WE WOULD BE HAPPY TO ANSWER THEM. THANKS FOR LOOKING.