Thanks for the reminder, its getting frosty now but only just, not really frosty of -10C or so.
Draining is important or at least cracking the tap open. I've had a yorkshire elbow fitting pushed off the pipe by freezing. Do not under estimate the strength of freezing water...
I would avoid pushfit fittings at 7.5 bar. I have known Hep2O to shoot off a pipe when a shower tap was closed fast, leaving an open end under a floor. Failures in plastic joints tend to be catastrophic. I would always have a shock arrestor on a pushfit plastic installation to protect the joints. I have known a Speedfit cap shoot off a cylinder and embed itself in the plaster on the opposite wall. Again an open end gushing.
Osma Gold's O rings have a "W" shape giving two points of contact. O rings are used in aviation, however not to the same standard as domestic plumbing.
The snips the makers provide to cut plastic pipes don't help as they leave a proud sharp point that can nip the O ring. I have looked at many "makers" cutters and they are waste of expensive time. Rothenburger have brought out
15mm and 22mm "pipe slice" plastic cutters to prevent this. They "turn", cutting the pipe properly.
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?_dyncharset=UTF-8&fh_search=22344&searchbutton.x=0&searchbutton.y=0&searchbutton=submitMost plastic pipe site installers would have a Stanley knife in their top pockets and trim off after feeling around the cut ends after using snips..
The instructions I've seen only want inserts for compression fittings, for example when joining to copper. And not all insert types give a chamfer, even if you used them on other joints.
You don't know much about this stuff do you? 10mm is more than adequate to supply a basin, even under gravity. As it is usually all one length of pipe with no elbows there is invariable less resistance. In fact 6mm is all you need in most cases using mains pressure. The smaller the pipe the less dead-leg pipe. In soft water areas smaller pipes sizes supplying sinks and basins is highly desirable. It is seen on the Continent a lot.
Iv'e always considered microbore to be 6mm or less. Drivel is right in that 10mm is used extensively in France But of coarse it is virtually all mains fed.
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