The diameter of the flange on the jet nut is very close to the face diameter of a conventional nut so no issue there. With the jet nuts I use a 1/4" drive ratchet to "run up" the nuts to 'near tight' while I position the pipes. Once I have the side pipes installed/tightened, I do the final tightening at the head with a 3/8" drive and deep 12pt 3/8" socket which gives even more room.
