I am a plumber for Len the plumber in Montgomery county Maryland. I use American standard for most of my products that I install in customers homes and never have any issues. But I bought this toilet for my house in my newly renovated bathroom. The day after I installed it I noticed it was leaking from the tank where the ballcock/ supply valve goes through and attaches to the supply line. It destroyed the brand new floor I put in there along with the trim. I am very disappointed. I still have not received the replacement tank in the mail but hopefully this one does not do the same.