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Hello - we have a heating system that was installed by British Gas around ten years ago. It's got two two-port motorised valves. These were originally British-Gas branded but as we discovered when one failed they're actually re-branded Drayton ZA5's. Both the original actuators have...

Not sure which subforum this should be in, please move if I've got it wrong. Familiar story - leaking sealant round a shower/bath that I hadn't noticed, only became apparent when plaster started to go powdery on the other side of an internal wall. The whole bathroom was professionally...