plastic plumbing vs copper - a moan.

You can buy rigid plastic lengths for surface work.

You can do that with copper using microbore.

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

I wouldn't run mains water through 10 m of microbore if I were you. I certainly wouldn't run gravity fed hot water through 10 m of microbore.

Fitting an insert as per the mfr's instructions effectively gives the cut end a chamfer, protecting the O-ring from the square edge.

That depends on if you are in a hard water area or not.

It doesn't.

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.

No it depends on if you want some water to flow at the far end.

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.

Who was talking about 10mm pipe? I only saw microbore mentioned, or am I some sort of plant pot?

Not if you buy the straight stuff.

Yes you can. You can buy formers to hold it in place at the minimum radius.

So? They're mostly hidden. They're not a lot bigger than copper compression joints.

That's user error.

Which needs special tools to put a bend in it, is harder to thread through joists, etc...

MBQ

You don't have a bath or a shower or a garden tap or anything useful?

So what do you call microbore: hypodermic needles? :-)

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.

Correct. Mini-bore above 6mm and small-bore using 15mm.

You are a plantpot.

You are very confused.

Does a junior hacksaw suffice for plastic microbore?