Yes, I am the stereotypical newbie turning to the elders for help. ^_^; So I am at the end of a bathroom remodel. I made it safely through the subfloor, heated tile elements, sinks, new toilet, etc. Imagine my surprise (or maybe not ^_^) that I'm dumbfounded on what specifically I've screwed up here. Let's start with pictures, that always helps. ^_^ So this is what I installed. A Delta Universal shower valve. (For the record, the joists were already burnt when I opened the wall up. I guess they didn't know tin foil had been invented...) A couple of those screws came out of course when it was time to put the faucet face plate on, so don't worry about that. I used a Delta RP46463 for the cartridge. And this is where I am at now. (I'm praying I didn't do something REALLY dumb that requires tearing tile and cement board out...) For some reason, when I put in the cartridge, (Yes with the "hot" label on the left side) and turn on the water, the water runs STRAIGHT through. Full blast. It's like the Delta cartridge isn't even there. I shut off the water, take the thing apart, and it looks... fine. The adapter in-between the cartridge and the valve is nice and snug (really snug) and screwed in as it should be. The cartridge slides right in and the "V" notches on it line up with the valve like a charm. Perfect fit. Does anyone have an idea or suggestion (or even question I could answer to provide more detail) on what may have gone astray? Any and all efforts are very much appreciated. Thanks!