Rocky Mountains have always had a white dot PRV. That is the highest pressure PRV that anyone is using in an I beam floor. The scale from least pressure to highest is: yellow 1.75, blue 2.0, brown 2.5 (looks like red but its not, red is higher than white and no one uses them), white 2.75. There are other colors like purple, red....etc but no one uses them in raft floors. Leafield PRVs are the industry standard and what we have to work with but are notorious for leaking no matter what boat you put them in. As soon as the smallest grain of silt gets in them, they leak. Pumping the floor until the PRV blows, or letting it sun pump until it blows are great ways to make sure that they will get silt in them and leak. Never letting a new valve break seal and puff off air is the best way to keep them from leaking, but they eventually will anyway. The sand screens that some come with are really good at trapping silt in and helping them leak. I clean my PRV valves out after every trip or two depending on where ive been. Always after a westy, cat or anything with fine silt. Almost every boat that comes into my shop has a leaky PRV. The silt and sand wear down the tiny rubber ring on the edge of the rubber gasket that makes the seal as well so they do need to be replaced occasionally. I would love to come up with a better design for a PRV but havent yet.