Are you sure it is the regulator? I would check to make sure the pigtails aren't the problem. This past summer both of my pigtails failed. I didn't know they had a high flow preventer in them, but they do. I would buy a replacement and install it first to verify the regulator is the problem.
I had a hard time believing both of my pigtails failed at almost the same time, but they did. They must have a "end of life clock" in them.
Ed
KM4STL
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch, Progressive Industries EMS-PT50C, TST Systems 507 TPMS
2010 Jayco Designer 35RLTS,Cummins/Onan RV QG 5500 EVAP
Fulltime since 2010