MDPE Pipe, Fittings and Valves. Pipestock is the UKs largest stock holder of water pipe and fittings for connection with MDPE Pipe. However you want to connect your pipework, Pipestock has the right connection. We have available from stock: Compression Fittings, Push Fit Fittings and Electrofusion Fittings. We also have vast range of complementary products including: Valves, Stop Cocks, PP Threaded Fittings, Clamps, Saddles, Tools and Accessories. We are one of a few select suppliers that stock the Protecta-Line Pipe System. If you need any help or you want to discuss your requirements please ring us.