been to fix a leaking stop tap in downstairs toilet it was black plastic pipe on one end & 15 mm copper pipe onthe other. The plastic pipe is coming under the concrete floor.I assumed the black plastic pipe 2 b 20mm mdpe pipe& bought a 20 to 15 mdpe fitting. Took old fitting off, 20mm side is too big & doesnt fit, neither does 15mm which is too small. Took the peice of pipe to plumbing merchant. Found out its old polypipe. Tried different shops, nobody stocks the fittings for this pipe. cant even put the old stop tap back as its broken.
Can anybody help please?