here's how i handle this...if a customer opts to buy any fixture or equipment through me, faucet, sink, toilet, water heater, etc., then I will handle any warranty issues and no charge for service if required on said item for 1 year. If they supply it themselves then I don't give them the same "service warranty". That is my gaurantee that I will stand behind "my products", always bought through plumbing wholesalers.