Hey all,

For the past few weeks, my Kohler toilet fills every 25 minutes or so, and stays on for about 15 seconds. I did some online searches, and the consensus seems to be that the problem is the result of a bad flapper.

I turned off the shuttoff valve, and inspected the flapper, and it still looks good to me. It says "Coast Foundry Made in USA" on it. Is there any way for me to know ahead of time if this problem is the result of the flapper being bad, or should I just go ahead and replace it?

If I should replace it, can anyone point me to a tutorial?

Thanks so much.