I think I have what you are looking for, but the one I have is off of a 72. This one is on the end of a hose that is attached to the charcoal canister. It is two piece, the mushroom top fits into a plastic tube that fits inside of the hose connected to the canister. It measures just over 3/4" where it pops into the tube and also where it fits into the hose. If it is what you need let me know. Thanks