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