I think that the 'forward" auxiliary pipe, ie the one that just plugs in with an O-ring is very loose. Looking at the workshop manual figure 35, on D:05:01 it shows this going to the "AIR" supply. It seems to me that if there was a leak at this point it really won't affect anything. Please explain if I am wrong. What are the specs of the O-ring will I need when I replace the pipe? Dave & 6530 [Non-text portions of this message have been removed]