The pump suction hoses are made from PVC (white hard PVC spiral). Due to its chemical composition PVC is resistant to aging & is not damaged by oxygen & ozone. For continuous outdoor use special grades are available which help to reduce the effects of weathering & aging. The suction hoses are dyed green transparent. The temperature resistance is between -5 ° C to + 50 ° C. For connection to the suction side of the pump.