alright, i checked it out tonight and i found one line coming off the back of the upper going to a silver round part. Then I got looking at the back of the upper a little closer and I found a hole like another nipple was there and it got broken off and sure enough it is sucking air in. Also I dont have the part that you showed the picture of. I got thinking I would just throw my old (off the 95 motor) upper on and I got looking at it and it only has one nipple. Why would the 93 have to? Looks like I am going to be making a trip to the junk yard.