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I am in the process of doing a quote for a contractor, and the specs he's been given to complete have several test certificates thet need doing at the end of the job. as I'm just a lowly wet plumber, I was wondering if anyone could tell me what they're relevant to, and who has to complete them...

A mate of mine has a problem with his central heating. The boiler loses pressure after a couple of days and stops working. But the expansion vessel on the other end of the system still reads sufficient pressure. How so? Don't know the make of the boiler, and he's nagging me to take a look...

you can buy a bottle trap with an anti syphon action- not much dearer than a standard. should cure the problem.