Gardena Micro Drip System PipeConnecting pipe 13mm is used to transport water to where it is needed. A maximum of 120m of connecting pipe can be used from a single tap and can be routed around the back of containers, buried or covered with mulch.Supply pipe 4.6mm is used to take water from the connecting pipe 13mm to plants, containers and hanging baskets. No more than 15m should be used in any single branch from the connecting pipe.