Fair point. I haven't ever seen a composite pipe in 15mm though - only in 16mm. Which is damn annoying, when you have a van load of offcuts and can't use any of them on general work.
Until about 7 or 8 years ago, UFCH was often 16mm, but this offcut issue (amongst other things) has catapaulted Polypipe and JG Speedfit to market leadership.
Yeah each system has its pros and cons. I think tectite have an MLC in standard sizes, but don't use press fit, they use tectite push fittings which can be expensive and fairly bulky.
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