Name: Rite-Temp Pressure-Balancing Mixer Cap
Brand: kohler
SKU: K-GP77759
Price: 44.5 USD
Availability: InStock
Rating: 3.6316 (19 reviews)

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Perfect fit. Fixed the concern. Easy to install, took 10 minutes

Perfect fit

I replaced the old mixer cap and the o-rings on the pressure balancer and it fixed my slow shower drip. I did not replace the old pressure balancer unit. I had some trouble replacing the mixer cap however, which I'll now describe in case it helps someone else.

The two machine screws that hold the white plastic retainer (part # 1006026) thread into both the metal flange on the mixer cap and also the brass valve housing that is in the wall. This is a no-no in mechanical engineering. It causes the two machine screws to bind as you tighten them to hold the retainer on. In my case, the 6 o'clock screw had also corroded/rusted a little over the years as any drip of water or condensation behind the faucet plate will find it's way down to the bottom where this screw is. I could not remove the screw (it was stuck). The Philips head kept slipping and stripped out some. I tried a screw-out bit in my drill, but could not get a good perpendicular angle with the drill because of interference from the mixer cap and white retainer, so all this did was strip out the rest of the screw head. I should have tried the impact screw driver I have instead of the screw-out bit, but I didn't think to try this at the time and also have some hindsight concerns now about impact hitting this screw in the brass valve housing unit in the wall and possibly breaking a pipe or something that would cost big bucks to repair. I then tried grabbing the screw head with needle-nose vice grip pliers but couldn't turn the screw and the pliers kept slipping off. Tried all sorts of pliers with no luck. Eventually I just broke off  the remains of the screw head (there was not much left of it by this point), thinking I'd then be able to remove the white plastic retainer (part # 1006026) and get a better grip on the remains of the machine screw with pliers.  Nope.  The retainer ring doesn't come off easily as other reviewers have commented. I was worried about prying it off in the wall and breaking something that would leave my house without water (my shower has no separate shutoffs, so I had the main water valve shut off when doing the work).

I ended up having to cut the metal flange tab off of the cap using a rotary tool and a cutting disc. This took some effort and multiple cutting discs (as the discs kept fracturing - a common problem when working with these discs). The white retainer that I couldn't remove also interfered with the rotary tool and made the cutting process more difficult. Once the tab for the stuck screw was off, I could remove the mixer cap from the wall. This exposed a good 1/4+ inch of the broken machine screw, and I was able to grab it with regular small vice grips. Much to my relief, with the binding pressure on the screw from the now removed mixer cap flange gone, the screw turned with little effort and I was able to get it out. I had bought a new retainer on Amazon for 6 bucks before cutting off the old metal flange and reaching the point of no return on the work, and installed it along with the new mixer cap and o-rings (which Kohler had sent me at no charge under the lifetime warranty - thank you Kohler!). I also bought two new stainless steel machine screws at the hardware store for the retainer ring instead of the original zinc plated screws that kohler uses. Before installing the new mixer cap, I considered drilling out the threaded holes on the.flange for the two screws that hold the white retainer in place, but I don't know what weird design kohler may have done so I was afraid something might leak (even though the mixer cap itself is held in place by two stainless steel screws at 3 and 9 o'clock). I just left it as is, and hopefully the stainless steel machine screws won't corrode and get stuck the way it did on me this time. Actually I hope I don't need to replace the mixer cap again!  Anyway, the shower drip is fixed, and I fortunately didn't need to call a plumber and have drywall removed to expose and replace the entire shower control unit in the wall.

Fixed the shower drip but had some trouble

Had a old shower assembly and I was worried if I will get a perfect match of parts. It was easy and the was able to fix the shower.

Really suggest Kohler to provide videos of these which will help!

Perfect solution

Meli A

This is the 5th time I have replaced this valve.  So far it has been holding but let's see how it holds six months from now. I am disappointed on the performance of this valve.  Let's hope it is better than the last four (4) I have replaced for leaks.

Shower valve

My Kohler$300+ single-handle shower faucet stopped adjusting the water temperature after just five years (installed early 2016, failed mid-2021). The water was either too hot or too cold. After researching this problem and calling Kohler, they sent me this mixer cap and the related Pressure Balancing Unit for free. I'm pretty handy, but it took me 2 hours to install it. I'm quite surprised there are no metal parts inside, just plastic. No other faucet in my house has failed after just five years. A few installation tips--the video available on this website is close but not exact. There are 4 screws that go into the Mixer Cap, not just 2 as shown in the video. Align the metal ring with four holes so the 2 biggest holes and 2 smallest holes align. The 2 larger screws go on first to tighten only the mixer cap. The red stop thing on the outside should be pointing at about 5 o'clock. Then what is NOT shown in the video is there's a white plastic threaded sleeve over the old mixer cap that you have to pry off with a screwdriver and reuse on your newly installed one. This gets slid over the new mixer cap, is secured with the 2 smaller screws from the old one, and is what your exterior metal handle screws onto. Without this plastic threaded sleeve, there's nothing for the handle to grab onto. There's also a square metal adapter for the end of the valve that you have to unscrew from the old cap and reuse on the new one. The printed instructions are similarly skimpy, but read them very carefully first and good luck!.

Surprised at what's inside

My original shower valve was leaking after about 10 years use.  I called Koehler and they shipped me a new one...free of charge.  The valve went in easily and shower works good as new.  Thanks Kohler for standing behind your guarantee.

Great Customer Service

Original part stopped shutting completely sooner then expected.   New part is working good.  Easy to change.   Some of the parts on the exterior of the new valve were cheaper looking although just so it continues to work properly I do not mind.

Original one broke sooner than expected

I just replaced my older model that was discontinued and replaced with the attached and Installed recently with the K-RGP800820 to replace well used older discontinued model. Easy swap, no longer uses the difficult springs. Handle movement is improved as well. Price was higher at the local store than Kohler online, but needed in a hurry to fix leaking shower head which lead to leaking faucet when trying to diagnose the problem.

Easy Swap Fixed Leak

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Bring reliable performance to your shower with KOHLER® mixer cap service parts for shower valve trim kits. The mixer cap kit is designed for compatibility with a wide range of KOHLER collections, including Memoirs, Fairfax, Rite-Temp, Revival, Bancroft, Stillness, Forte, Purist, and Coralais. Engineered for pressure-balanced shower valves, this kit helps maintain consistent water temperature and ensures smooth operation. Ideal for both routine maintenance and repairs, it supports the long-lasting functionality of your KOHLER shower system.

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