BestNest Cal Pump PWM3900 Waterfall Pump and Prefilter, 3300 gph Contains Cal Pump PWM3900 and TS1.5 Prefilter This pump features a magnetic drive motor capable of turning 3300 gph at 1' It accepts a male 1.5" NPT threaded fitting for straightforward plumbing. Install the TS1.5 on the inlet to elevate the pump from any debris on the bottom of the water feature.