C-100500-K C-100500-Kit Replacement Cartridge Kit Flush Valve Cartridge Assembly Kit for m-101526-f3 503 504 Cartridge, White, 1 Pack

I just followed the manual so RTFM (read the factory manual) after a few turns and tries the toilet stopped running. pretty much you start screwing the valve into the flushometer, then you open the toilet shut off and keep turning the valve until it pressurizes. I has to do it like 2 times to get it to work and now the toilet works normal. I'm going to check how long it takes until this needs to be replaced but good product overall

Edit: As karma would have it, the day after I write this review, the cartridge has issues and water is flooding through and over it causing a leak under my toilet. Had to shut the water off and decided to re-order the official OEM part. So much for this experiment, and outside my return window.My flushmate was having issues where after flushing, the water refill wouldn't stop until I fidgeted around w/ the cartridge. Eventually started looking around for a replacement cartridge. Looking at the manufacturer's website, it was fairly pricey so off to Amazon to search for an alternative when I ran into this. Was priced better so I gave it a shot.Installation was straight forward just following the instructions. You use the end of your pliers to tighten it as instructed until you stopped hearing the water filling. All worked well for about 2-3 weeks when the problem started happening again. Again, the water would only stop after fidgeting with the cartridge. Luckly it happened in less than a month where I had the opportunity to file a replacement with Amazon.Replaced the replacement and everything has been working for the past few months so this is great. Again, just lucky enough I was able to get the replacement replaced within the right amount of time, which is why I docked 1 star. Otherwise, I would recommend this replacement cartridge over the official one.

My flushmate was having in-complete flushes for quite some time. Thought it was a clog but my plumber recommended replacing this. This was a perfect fit, and easy install. Fixed the issue immediately. Highly recommend

Too much plastic, definitely not as good quality as the OEM, but for the price it does the job for now.

I bought this because it was cheaper that the original replacement part. Cheap being the operative word! I installed it, following the instructions exactly. The instructions were actually very good. It worked great at first and then, a few days later it started leaking out of the top of the stem. Apparently, the cheap rubber diaphragm had ruptured. Fortunately, I noticed the water running and shut it off right away. Order the original replacement part.

Product felt well made and includes helpful installation instructions and is decently priced.

This flush valve installed easily, however after a few flushes it would start leaking. Upon removal the lower rubber O ring had slipped out of its grooved position. After many attemptsto correct the O ring kept failing. I finally corrected the problem by using the old O ring from the old valve. The new ring is too thin and slips out of its space under pressure. Do not recommend.

fix & worked as well as the OEM