1.5 HP Waterway Spa-Flo II Pump: 1.5" in/out 48Fr-120V

1.5 HP Waterway Spa-Flo II Pump: 1.5" in/out 48Fr-120V
1.5 HP Waterway Spa-Flo II Pump: 1.5" in/out 48Fr-120V
1.5 HP Waterway Spa-Flo II Pump: 1.5" in/out 48Fr-120V
1.5 HP Waterway Spa-Flo II Pump: 1.5" in/out 48Fr-120V

1.5 HP Waterway Spa-Flo II Pump: 1.5" in/out 48Fr-120V

Regular price $309.95
Qualifies for Free Shipping Free standard shipping to US contiguous 48 states for $100+ merchandise total.
Delivery to US-48 Only This item is not available for delivery to Alaska, Hawaii, or Canada.
  • In stock, ready to ship
  • Inventory on the way
Ships next business day.

Durable Waterway Spa-Flo II Spa Pumps are simple to install and provide years of trouble-free use. Because of our huge buying power, you'll pay less for a complete new hot tub pump (motor & wet end) than some others charge for just a replacement motor.

  • 1.5" Side discharge
  • 2-Speed
  • Direct replacement for Aqua-Flo Flo-Master FMHP

Product Notes: 110 - 120V, 2-speed; easily configured for 1-speed. Waterway uses various motor manufacturers, so capacitor location may be external or internal. Order new pump unions if needed. Some brands (such as Hayward, Jacuzzi or Sta-Rite) may use non-standard fittings with different dimensions.

Pump Selection & Installation Guide

Voltage: 110-120V

Speed: 2-speed: 3450 RPM high/1725 RPM low

Horsepower: 1.5 HP

Amperage: 13.3A high/4.1A low

Gallons Per Minute: 125 GPM (high speed)

Frame Size: 48 Frame

Intake: 1.5” plumbing (2.375” O.D. pump threads)

Discharge: 1.5” plumbing (2.375” O.D. pump threads)

Discharge Type: Side

Wet End Discharge Orientation: Top (can easily be rotated)

Overall Length: 16”

Waterway Cross Reference: 3420610-0Z, 3420610-1Z, 3420410-S1Z,  CP-15-2N11CD, CP-15-2N11MD

Aqua Flo Cross Reference: 02010422-5, 02110000-1010, 02115000, 02115000-1010, 02115000-1040, 02115000-2010, 02115851, 03115452-2, 1431501-01, 1431501-03, 93495111, FMHP551521

Other Cross Reference: 1-00-0208, 34-402-5002, GK020100001010, FMHP-551021

Motor Cross Reference: RB804, BN50, 5KCP39SN4457X, EZBN50

Warranty: 12 Month Limited Warranty

Horsepower Ratings

Horsepower ratings on your old pump or listed in your manual may be overinflated, inaccurate, or even left blank. The true horsepower of the motor is not required to be listed on spa pumps, so spa manufacturers may list a different rating for marketing purposes.

To avoid getting the incorrect pump, use the Amperage rating listed on the old pump's label instead of the horsepower. The amperage rating is listed with both high/low speed for a 2 speed pump.

Determining Spa Pump Plumbing Size

Pump plumbing sizes are nominal and not actual outside diameter (O.D.) of the threaded intake or discharge. Use a tape measure and check the diameter of your old pump thread size.

  • 1.5” Pump thread measures approx. 2-3/8” O.D.
  • 2.0” Pump thread measures approx. 3” O.D.
  • 2.5” Pump thread measures approx. 3-5/8”

Orientation of Wet End

Pump wet ends can be oriented in 90º increments to meet your installation requirements. Loosen the four through-bolts from the back of the motor and pull them back enough to disengage. Then rotate the wet end to the desired position realign and re-tighten the bolts. 

Side or Center Discharge

The two spa pump form factors refer to the outflow or discharge fitting on the Wet End. Your old pump will be either Center Discharge or Side Discharge.

In most cases you need to match the existing form factor to get the components to match up. If you can use either form, select Side Discharge, which is more efficient than a Center Discharge pump of the same horsepower.

Motor Frame Size

The physical size of the pump motor is referred to as frame. Spa main pumps will have a size of either 48 frame, which are approx. 5.5" diameter, or 56 frame, which are approx. 6.5" diameter.

Since motor manufacturers do not label frame size consistently, you should determine a motor's frame size by measuring the spacing between the through-bolts on the back of the motor. Bolt spacing on a 48 frame motor will be less than 4 inches. A 56 frame motor's bolts will be spaced more than 4 inches apart.

Note: Because of their lower cost and compact size, most spa pumps in service are 48 frame. The larger 56 frame motors are a little more expensive and somewhat stronger. They tend to operate a bit cooler than 48 frame units, which can mean longer service life.

Configuring a Pump for 2 or 1 Speed Use

Our 2-speed pumps can easily be configured for 1-speed. Wire the common and high speed terminal connections, while leaving the low speed terminal blank.

Customer Reviews

Based on 61 reviews
Just as promised

Great customer service helping me find the right pump replacement for my spa. All the specs were correct and it was delivered within 3 days from my order. SpaDepot is awesome.

Be careful to get the correct wet head

Some systems utilize 1-1/2"" piping and the adapted to a 2"" wet heD. Also the number of small hose connections

Recommend this unit

Runs quit. Easy installation. Spa Depot people very helpful as usual.

Robert P
Very powerful.

The new pump made my old tub better than ever.

Spa Man
Great Hot Tub Pump

Great quality pump and at a reasonable price. I would buy again.

On time and correct fit

Replacement pump and motor were easy to find. The parts arrived on time and everything fit exactly as advertised. The spa runs better than it has in years.


Great customer service, very knowledgeable

Replacement Hot Tub Pump

VERY helpful. Got me the correct Pump and was there for questions. First Class operation.


Way better than original. Heats water faster. It maybe a little noisy but not thst bad

excellant customer service

I have a very old spa, with a few pics, customer service hooked me up with a new pump, control unit & gaskets. Quick shipping too.