Hi all and thanks in advance. I purchased a pfister tub/shower faucet set which is replacing a kohler set. I know the cartridge in the wall is kohler because I just dropped a grand on a plumber to do a bunch of stuff in my condo including swapping out one of those due to a drip. Question - will this pfister set install into the kohler cartridge? Or must I go and buy a pfister cartridge? I have seen several references to "valves" etc, but damn, i thought i would be unscrewing a few screws and popping this in and tightening said screws and showering immediately.