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It's the standard here, Spain. Joan guest and push fit isn't s thing. This is isoltubex Multilayer pipe (Plastic, aluminium, plastic) then crimp connectors. It's a bit fiddly to wield manual clamp as heavy but it's 100 eur and an auto one is 1000. I ran single strands of pipe from a collector so there are no joins under the floor. A lot cheaper than copper, which isn't the standard here, for anything but heating and then not always heating - my heating is copper. The rest of the piping in my house is PEXA and 20 years old and solid. I use a couple of compression fittings due to sizings or spacing.
Nice, looks good. Long way ahead of me. Finally commissioned my plumbing today. Only one fixing weeping. Hope to be done by mid November.