This is the main supply LDPE pipe that carries the water around your garden, allotment, patio or greenhouse irrigation system. 13mm refers to the internal diameter( id) of the tube, the external diameter is 16mm. Use 13mm Barbed connectors for joins, corners. This pipe is black and is UV stabilised for longer life.
Supplied with a pack of 50 fittings: 1 X Valve 23 x elbow 10 x tee, 8 x end plug 8 x straight connectors