Hi all- We just moved to a new house (as you may remember from other posts) and I am still trying to square away the existing system. I have searched here but did not find anything and have contacted Hunter through their web site but have not heard back from them yet. I am sure they will at some point but even still I am wondering what your thoughts are.... The system was installed in 1998 and consists of about half PGP and half PGM spread over 5 zones (there is a single spray head). There are two heads I need to replace and one is a Toro v1550 that I assume the previous owner installed as a replacement. I learned from reading here that even if I could find a v1550 I do not want to use it so my question is...how do I figure out what to replace it with? I would say PGP because that's what the other are in that zone but they don't make them any more. Any thoughts would be appreciated.