For a non-permanent distribution system PE pipes with PP-compression fittings are very widely used. These fittings can be installed without tools and if needed the whole system can be disassembled and moved to another place. These type of systems are currently also being installed in some remote...
Georg Fischer Waga B.V. in the Netherlands is producing the end caps you need. These type of joints and end caps are widely used in Europe. You will find them at www.waga.nl
