This Pump is a Perfect Replacement for a Watkins 39578-03 Pump it is a 2.5 Horse Power 12.0/4.4 Amp (2) Speed 56 Frame Complete Pump.
It is about 7 1/4"" across the face of the pump, it measures about 7 3/8" from the bottom to the top of the pressure side of the volute, it also measures 15" from the back to front edge. The Suction and Pressure side thread fittings are called 2" x 2" but measure 3" from the edge of the thread to the edge of the thread.
Note: There are other companies offering other brands that are not exact fit for your tub.. This pump is an exact fit..
NOTE: We do not recommend using the air vent found on the back of Watkins brand pumps as it will lessen the life of your motor because it will not allow it to cool..
NOTE: This Pump looks a lot like an Aqua-Flo and a CMP Pump and they will interchange if you replace the entire pump!
For the Bleeder Barb That fits this pump click Either of these links one is a 1/4" and one is a 1/2":
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