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1.5 HP Spa-Flo II Pump 2 Speed 115V 3420610-S1Z 1.50HP 115V - Bubbles Supply

1.5 HP Spa-Flo II Pump 2 Speed 115V 3420610-S1Z

Part #: 3420610-S1Z

$932.05
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this spa pump

This Waterway Spa-Flo II 1.5 HP two-speed pump delivers reliable circulation for hot tubs requiring 115V power. Built with a 48-frame motor, this main pump provides both high-speed therapy jets and energy-efficient low-speed filtration. The dual-speed design lets you enjoy powerful hydrotherapy when you want it, then automatically switches to quiet filtration mode to keep your water crystal clear.

As an OEM Waterway replacement, this pump ensures exact fit guaranteed compatibility with your existing plumbing and electrical connections. We ship same-day from our Canadian warehouse and back every pump with a full 1-year warranty for complete peace of mind. Before installation, verify your current pump's frame size, voltage, and connection types match these specifications to ensure proper fit and performance.

Exact part number

3420610-S1Z

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 3420610S1Z
  • Spa-Flo II 1.5HP 2-Speed
  • Waterway Spa Flo 2 Pump

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Voltage
115V
Horsepower
1.5 HP
Frame size
48Y
Speed
Two-speed

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Pump won't start on high or low speed
  • Motor hums but impeller won't spin
  • Weak jet pressure at high speed
  • Spa not completing filtration cycles
  • Pump runs loud then trips breaker
  • Visible seal leak at pump housing

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy β€” quick checklist

  • Confirm your existing pump is 115V β€” this will not work on a 240V circuit
  • Verify frame size is 48Y on your current pump's motor label
  • Match the plumbing union size and style before disconnecting old pump
  • Confirm your spa controller supports a two-speed pump on its pump port
  • Note your current pump's HP rating β€” do not upsize without verifying your spa's electrical capacity

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium β€” Some experience neededTypically 60-90 minutes

What's in the box

  • Waterway Spa-Flo II pump assembly
  • Pre-installed wet end and motor

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee β†’

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers β€” no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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