Hills Trade Trusted Garden Watering Hose 18mm X 30M Kink Resistant Our Trade Trusted hoses also have 3 layers of construction, but their thicker walls make for a more robust product needed in tougher conditions. They come in the standard 12mm sizing as well as an unfitted 18mm size, which is ideal for situations that require a higher flow rate. The rural or trade customer requiring a durable hose, with the option of higher flow rate would gravitate towards these hoses. All Hills hoses are UV resistant for Australian Conditions.