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All I can say is that there are some really rubbish ones round - don't touch the Screwfix ones (FloPlast?) for example, they are ones I've had to replace, as one by one their seals have failed (they use a lip seal, rather than the O ring most use - not good in my experience). I've settled on one local supplier to me, Pipestock in Romsey. Not the cheapest, but they stock Plasson fittings that are absolutely bomb-proof, probably an order of magnitude better than the crap sold elsewhere. They do a reasonable mail-order service too, but for me it's quick to just pop down and pick stuff up. Their website is: https://www.pipestock.com/plasson