You are buying a 4 HP 48 Frame Waterway Executive 2" X 2" Wet End / Pump and Barb Kit complete with Screws, Volute, Impeller, Seal, Face, Wear Ring, Silicon & a Barb that you attach a 3/8" Bleeder line to. The difference between a 48 or 56 Frame wet end is the spacing of the Motor Thru bolts. The 48 Frame will be 3 5/8" between or 5 3/16" in a X Pattern and the 56 Frame will be 4 1/8" Between or 5 3/4" in a X Pattern. The pump amperage will be about 14.0 Amps at 230V that this wet end fits.. There are no 4HP at pumps that are 115v..
Look on the label of the motor for the two amperages if you have a 2 speed pump, if its a single speed look for a single amperage. It will look something like this: 10.0/3.5 The 10.0 is the high amperage in this example. 8.0 = 1 HP 10.0 = 2 HP 12.0 = 3 HP 14.0 = 4 HP 16.0 = 5 HP NOTE: Your pump or motor may say a different Horse Power than what you see here, DO NOT go by what is listed on the motor, go by the amperage on the label. NOTE for the NOTE: TRUST ME ON THIS, everybody lies about their Horse Power. But the amperage does not lie. Most people are told they have 5 HP pumps, if you do the math two 5 HP pumps at 16 amps is 32 amps. Plus a 5.5 KW heater is 21 amps. That means with both pumps running and the heater on it will draw 53 AMPS. I bet your HOT TUB is on a 50 AMP breaker. Therefore contrary to what you have been told you DO NOT have a 5 or 6 or 7 Hp pump.
Here are links to the other version of wet ends related to this type..
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