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Suction tubes are made from black steel pipe. The tubes in this chart are based on using no check valve. Subtract 5" from the tube length if using a 9:1 low-level cutoff. If using a 9:1 Series 425 pump order TIM-161 pipe coupler separately to connect the suction tube to the pump.

26" Long Black Steel Downtube
For 5:1 Thunder Pump or 9:1 pump. 1-1/2" NPT (M) thread on both ends.