1 metre 10mm Polyplumb polybutylene barrier pipe
Buy as much as you like (up to 50 metres) and get it all in one big length of pipe.
Polyplumb fittings feature a one step jointing process and a high performance stainless steel grab ring within the fitting, ensuring superb joint integrity. Use Polyplumb with Polypipe grey polybutylene flexible pipe, or you can combine Polyplumb fittings and copper pipe.
Polyplumb recommends the use of a Polypipe metal or plastic pipe stiffener when used with plastic pipe. Polyplumb is suitable for use in most plumbing and heating installations including hot and cold water and underfloor heating applications.
More information and instructions are available from the manufacturer http://www.polypipe.com/