4HP Executive Pump 230v 2-Speed 56 FR 2 1/2 Inch 3721621-13 Niagra

Waterway Executive 4HP, 2-speed, 56 frame, 230V spa pump 3721621-13 is a complete, brand name replacement hot tub pump by Waterway Plastics.

This 4HP replacement pump has the larger intake for 2 1/2 inch plumbing.  
If 2 inch plumbing connections are needed on both the suction and discharge, then see 3721621-1D. 

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This 4HP 56 frame Executive pump has the larger 2 1/2 inch intake and standard 2 inch discharge.
This is the original motor and wet end. 

• 56 Frame Executive Wet End
• 56 Frame Executive Motor
• 2 1/2" Intake for improved flow  (actual suction measurement 3-11/16"od)
• 2" Discharge  (actual discharge measurement 3-1/16"od)
• High Speed Amps:  12 amps
• Low Speed Amps:  4.4 amps
• Wet End can be rotated
• Viton Shaft Seals
• 2-Speed Motor
• 4 Horsepower
• 230 Volts
• 60hz for North America

Pump cords sold separately if needed (AMP or JJ) but most of the time, the existing pump cord can be used if it is in good condition. The current one already has the right plug on it to match up and plug directly into the spa control system, circuit board or pack.  Wet end can be rotated in 90 degree increments to line up with your plumbing.  This is a thru-bolt type motor/wet end/pump.

2 1/2” threads measure 3 5/8” OD
2” threads measure 3 1/16” OD

This brand name dual speed motor has double-shielded ball bearings with moisture-resistant grease for quieter operation and longer life too.

This pump model also used to replace 5HP Niagra pumps.  The rating of this pump is 4HP continuous which is the same performance as pumps labelled 5HP brake torque/non-continuous.

Note this the deluxe version of this brand name Waterway Executive pump that comes with full factory warranty.

Need orings? See the larger 2 3/4" ID oring O-245 and the standard 2 1/2" ID O-43 oring.

Unions?  The 2 inch pump union is 0602-20 if needed. The larger 2 1/2 inch pump union for the suction side is 400-5990 if needed.

Cords?  We offer 30-1001C 2-speed, 4 pin AMP pump cords and 30-0220-48 molded LIT cords as needed.