Review on Replacement Ceramic Cartridge Quarter Bathroom by Kyle Tran

They fit and replace kohler oem gp77005-6. I can't comment on the durability or quality of the product, but I just installed it in my kid's bathroom and it fits (almost) perfectly. I say almost because the conical cap sits a little lower, but that's beside the point. For a third of the price I was able to successfully replace Marken-Kohler and restore full functionality. Buy yourself a caliper and measure the fit - that's all you need because if they fit, they all work pretty much the same.