Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Why does the pressure balancing valve fail every few years?
Document: I gave it 4 stars because I find myself replacing these thing about every 7 years or so. I FINALLY put my &#34;finger on the leak&#34; so to speak. One would think that the &#34;leak&#34; (out of the tub's spout) would be from a worn part. The valve that you move to dial-in the proper temp. would come to mind. WRONG. This pressure balance valve body develops tiny fissures over time.
I highly recommend getting this whenever you replace the mixer valve. I installed the mixer first but the problem was the pressure balancing unit. Works great
This shower pressure balancing unit was easy to install and worked the first time.
We had a slow leak in the shower. I replaced the old pressure balancing unit with this one and the leak was gone. Make sure you install the unit the right side up.
Leaks problem is solve when I use the Kohler GP500520 Shower Pressure Balancing Unit.Simple to install, to be sure it's better to buy the complete set. Thanks.
I could not find the replacement part at Home Depot. They had the control valve but not the balancing unit. I ordered the part on Amazon with local delivery. It came on time and I installed it as per the directions without any problems.
My Kohler tub/shower faucet was leaking after 10 years and, since I am not the original purchaser of the faucet, no Lifetime Warranty. Choice: call a plumber (about $175 parts and labor) or order and DIY. The Kohler website was helpful in figuring out the correct parts and the rest is history. I thought I could get by with just the Mixing valve, but in fact also needed to replace the PBU.
The bath/shower unit itself seemed to be working fine, but I'd been having a problem with a cross-connect in the house for months (hot water coming out of all the cold taps initially until the pressure equalized). So I started replacing all the single-pull valves in the house. Finally, when I replaced this component, the cross-connect stopped. Would have been better if the original unit had held up better in the first place ... was only 9 years old.
I replaced this pressure balance valve but it didn't fix the leak from the shower head. Then I replaced the Kohler GP77759 Mixer Cap too and that fixes it.
I bought this with the pressure balance valve to stop a leaky showerhead. The installation was easy. My only advice would be to buy this together with the valve. Once you crack this open, you'd be very lucky to get the o rings and seals back together without a leak by only replacing one. While you're in there, do them both. Would have given this 5 stars, except for the price. While the price is high, it was significantly cheaper than buying at a plumbing supply store.
Answer: yes