Bought Doorman heater hose fittings product 47065HP about 6 months ago for GM auto. O-rings just started leaking. Did research on internet and found out o-rings do not hold up (faulty product). Called Doorman company and explained. All I asked for was a replacement of the faulty o-rings, not even the whole product. They kept passing me off to different people. The final person I talked to said its not our problem to deal with the public on this. I started explaining more and he very rudely hung up on me. And this is business like quality to hang up on the customer. I don't think so Doorman Products. My rating and experience with Doorman Products is a negative 5 and will never purchase their products again. This is a company that sells things and if they don't hold up, it's your problem. Great solution Doorman Products! Would love to hear from anyone else who has had an experience with them.