You are buying a 1 HP 48 Frame Waterway Executive 2 1/2" X 2" Wet End / Pump complete with Screws, Volute, Impeller, Seal, Face and the Wear Ring. 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 8.0 Amps at 230V or 12.0 Amps at 115v that this wet end fits..
Note: A regular 2" pump union fitting measures about 3" edge to edge but this wet end is different on the front suction side and it measures about 3 5/8" edge to edge so be sure your wet end has a large suction side fitting before ordering this..
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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