I've had the back off the panel behind the water connections and filter area and didNOT see anything that looks like a pressure valve anywhere, so, I'm sure there is NOT a pressure reducer/valve on any Columbus.
Rod & Linda Johnson
2006 F-250 SD 4x4 6.0
2012 Columbus 320RS
K-9's Lucy & Lizzie
Enjoying Life 1 Campground at a time