The Waterra High Flow System is designed to be used in 2 inch wells or larger where a high pumping rate is desired or where very deep wells are encountered. The Waterra High Flow System can provide lift of up to 76m-91m (250ft-300ft) in 2 inch monitoring wells and flow rates of up to 15 Litres per minute. Foot-valves / check valves consist of a check ball inside the valve body, available in stainless steel, suitable for use with larger diameter tubing (size 25.5 mm OD x 20.7 mm ID) or (1 in x 0.8in). Tapered threads enable the foot-valve to self-tap onto either end of the HDPE tubing.