Originally Posted by rjwilliams11741
I did not know that the older design filler neck used a 4 psi cap. My filler necks were upgraded by the PO. The newer design necks can be identified by the fact that some kind of epoxy compound was used to seat them into the expansion tank.
I only learnt of the 4 psi cap emailing American Dsl about new ones. My necks look unmodified, caps need replacing. May chase 4psi ones here(lowest so far is 7),if unavailable, need to choose between 7 psi or ordering from Amerdsl in USA. BruceK