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I want to use a half (or part) crossover in a horozontal pipe run to cross over a pipe which runs parallel to the rafters in a loft (i.e. it slopes). One side of the crossover feeds directly into an elbow connected to a pipe parallel with the one crossed over. (The reason for this is to get the...

I'm about to fit a secondhand ("Pre-owned"/"Pre-loved"/Recovered - call it what you will) Lifestyle motorised valve. Question is: which way round does it go? (a) so that the flow tends to close the valve flap (and the motor has to overcome the spring and the flow in order to open the valve), or...

I've recently been close to a (contractor's) job which involved fixing Celotex sheets. A quantity of offcuts remain, and I have a possible use for some. This would involve copper pipes passing through the Celotex. The pipes carry water which may reach 100 degC. Does anyone know how Celotex...

Whilst trying to locate a new lid for an old CW tank, I encountered "screen warning pipe elbow" as part of a kit of bits for installing a F&E tank. Please can someone tell me what a "screen warning pipe elbow" is, what its for etc. Something to do with Bylaw 32? Please excuse the ignorance.

I'm toying with using a Vaillant 16-0108 pump for an application which is nothing at all to do with a Vaillant boiler ('cos I can get one cheap). As the pump is listed as a spare for several boilers, I scoured this site to try to find out exactly what it does in these boilers. If I knew, it...

I'm looking into installing a secondary circulation system, but I can find precious little information or comment about it. Any help, please? Does anyone know where to start looking for a suitable pump? It doesn't need to be capable of much flow (0.5 litres/min ?), but does need to operate under...