the check valves seem to be the same for all their systems. they are RAP10021 and a local place has them for 18 bucks. a set of 4 of them.
my coach is not here at the house but i have pictures of the bay the solenoids are in and they seem to be the same as larrys, and since his is in the front yard we looked at them. they measure 1.5" diameter and 3" long on body which appears to be HWH RAP90729
i am awaiting confirmation on that.
tom
2014 Haulmark 40' Super C on Freightliner Cascadia ISX15 Easton 13 speed
Former Owner 1990 38' Newell Coach 236 8V92
Former Owner 1999 45'8" Newell Coach 526 Series 60
Former Owner 2002 45'8" Newell Coach 608 Series 60