Neltex - PPR pipes should be with the right size and thickness to ensure right pressure rating and perform exactly per your plumbing design. Here's a quick guide on PPR pipe dimension
What about the specification and size of PPR pipe and fitting? | Pvc fitting factory
PPR Pipes
PPR pipes -
Hot and Cold Water Piping Material Comparison: CPVC vs. PPR
Bina Plastic BBB Hot and Cold PPR Pipe PN20 (S2.5) - Plumbing Supplier Malaysia