Want to check a few things before you call us? We offer a range of boiler manufacturers. We can take care of all of your plumbing needs, so please. I don't know - it would make me a bit suspicious if anything like that was refused although probably yes but your buyers sound very different to me if they are continually trying to get money off for stuff i totally get why you are frustrated! Over the course of time, drainage systems are subject to a range of external problems that can cause.