BestNest Cal Pump T4000 Torpedo Pump and Prefilter, 4000 gph Includes Cal Pump T4000 and TS1.5 Prefilter. The 0.33 Hp, direct drive motor can move up to 4000 gph at 1' Prefilter helps prevent debris and allows for additional setup options. Outlet accepts female 1 1/2" NPT threaded fittings