Installing a Kohler Rite-Temp pressure balance bath & shower valve, K-304
Rough in instructions from Kohler with some added tips.
Most plumbers will remove the cartridge, and solder pipe to the valve body first, and then reassemble the valve. The valve comes with the option to thread on a "female adapter", or to insert copper pipe into the brass body of the valve. I prefer to solder copper pipe to the valve.
two, The pipe to the tub spout needs to be full size. No PEX here. PEX is undersized for a tub spout and will force water up toward the shower head. Either copper or threaded pipe like galvanized or brass. I use either copper or brass. Galvanized will rust and the first time you open the faucet in the morning, you will get some rusty water.
three, if you have a back to back installation like below, you can reverse the valve without making the pipes cross over.
One "minor point". Valves which have the option to solder the tubing directly into the valve, have MALE threads, so you would have to use a "female" adapter, NOT a male one, to connect to the valve. And do you really think plumbers or most handymen/DIYers read the directions?
I just went back and made that edit. It was Sunday, what can I say?
Last edited by Terry; 05-02-2011 at 09:21 AM.
I have loads of water pressure however, after installing the K 304 valve and turning on the water nothing comes out except a couple of drips. It's like the flow is restricted somewhere. I removed the pressure balancing unit and confirmed that yup, loads of water pressure.
Could my pressure balancing unit faulty right out of the box as it seems to be restricting the water flow to the point of nothing coming out?
I'm at a loss.
Any help would be appreciated. THanks
Is it a tub and shower Or shower only? If shower only check restricter in shower head.
As long as both the inputs see similar pressure, then yes, the valve should open and work 'normally'. Course, you'll have no temp adjustment, but you probably knew that.
Important note - I'm not a pro
Retired Defense Industry Engineer
I stayed there before, and noticed that some showers only have cold water. Same thing in Guatemala.
You will have to run water to both sides. If you have a water heater hook-up, you can flex the cold over to the hot side.
The prohibition "Do not install the valve upside down" ONLY applies for a tub/shower installation. In a shower only installation, I ALWAYS install it upside down. There are two good reasons for doing so;
1. the bottom port is larger than the upper one so you get maximum flow to the shower head, and
2. The capped bottom port, unless it was a "shower" or "tub" only valve, can accumulate debris and eventually stop flow to the shower head. Removing this debris can be a difficult job, especially if it is calcium build up in the transfer tube between the lower tub outlet and the upper shower outlet. (the last one I did was especially challenging because they had soldered the brass cap on. I had to unsolder it, while unscrewing it, and at the same time not drop the hot cap down the wall since I did not have a replacement for it.)
Thanks for the tips. It is a shower only instal so I guess putting the valve in upside down would make better sense. Now, is there anything else I should know before I cut out the PVC (my last weekends' chore) and replumb?
Serious though, thanks for everyone's advice. I know what I'm doing this weekend.
Last edited by bananavida; 06-08-2011 at 06:59 AM.
quote; It is a shower only instal so I guess putting the valve in upside down would make better sense
Just be sure to "reverse" the cartidge or you will get hot water first instead of cold.
Internally, when the valve is in "upright" the right is cold and turns on first. Rotating it 180 degrees puts that side on the LEFT so the hot will flow first. So you rotate the "core" back 180 degrees so it is oriented the same way it was to start with. If you remove the core and remember HOW it was oriented, i.e. which side was UP, and reinstall it the same way you will do the same thing.
Last edited by Terry; 08-06-2011 at 01:04 PM.