Greenhouse watering system

These are parts to a greenhouse watering system I am currently trialling in my greenhouse. It consists of a ring around the greenhouse constructed from garden hose, held to the greenhouse by clips that friction lock into the channels in the uprights by inserting and twisting. Short lengths of hose are connected by T-pieces That allow water supply to be tapped off to 6mm OD (Outside Diameter), 4mm ID (Inside Diameter) piping (that I had from a cheap shop bought drip watering system that I really didn't get on with). I believe the piping I have is made from vinyl.

In addition to the clips and T-pieces, files for corner pieces and an end piece are also available. The corner pieces allow the hose to be more neatly routed around the corners of the greenhouse without kinking the hose. The end piece has a connector on the end of it to allow 6mm OD tubing to be connected, but a thin wall is left in the design so that this is optional - drill out with a 4mm drill to use.