PrintTorque Arrestor Minimizing starting torque movement to prevent damage to a submersible pump, a torque arrestor is installed above the pump to prevent the drop-pipe from unscrewing in the well. Specs/Part #s Unit Weight in Lbs. Drop Pipe Size Casing Size Part Number 2 1/2 1" to 1 1/4" 4" to 8" SATA48