i am about to do some work on a water main, the pipe is balck plastic of 21mm O/D, i am getting conflicting information, one says that in the 22mm plastic pipe i need a stifener, another says i dont. i now have a 25mm elbow(plastic) with 22mm copper fitting on the other end. i still dont know if i need a stiffener, although i am told there are about 6 types, one guy told me that he needed a sample of the pipe, which is im[possible to give until i do the job, so im in a bit of a quandry. i understand the differnt types are due to the wall thickness, but surely the black pipe will have a standard wall thickness that you could say was standard.
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