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2.5 HP EX2 Spa Pump 2 Speed 230V 3421021-1U 2.50HP 230V - Bubbles Supply

2.5 HP EX2 Spa Pump 2 Speed 230V 3421021-1U

Part #: 3421021-1U

$465.39
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Also replaces

3421021-1U
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this spa pump

**Waterway EX2 2.5 HP Spa Pump - 230V Two-Speed Circulation**

This genuine Waterway EX2 main circulation pump delivers reliable 2.5 horsepower performance for medium to large residential spas requiring 230-volt operation. The two-speed motor provides efficient low-speed filtration and powerful high-speed therapy jet operation, while the 48Y frame design ensures compatibility with standard spa equipment pads.

Built to Waterway's exacting OEM specifications, this pump features the proven EX2 wet end for superior hydraulic performance and long-term durability. At Bubbles Supply, we guarantee this is the exact fit for your spa replacement needs, backed by our 1-year warranty and same-day shipping on in-stock orders. Verify your existing pump's voltage, plumbing connections, and mounting configuration before installation to ensure proper fit and operation.

Exact part number

3421021-1U

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 3421021-1U
  • EX2 48Y 230V Main Pump
  • Waterway 3421021
  • Waterway EX2 2.5HP 2-Speed Pump

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

Technical specifications

Voltage
230V
Horsepower
2.5 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 or trips breaker on startup
  • Motor hums but impeller won't turn
  • Weak jet pressure on high speed
  • Pump runs on low speed only, won't shift to high
  • Leaking from pump housing or wet end
  • DR error code on spa controller indicating low flow

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

Before you buy — quick checklist

  • Confirm your existing pump is 230V — do not install a 230V pump on a 115V circuit
  • Match the HP rating on your old pump's label — substituting a different HP can cause controller faults or inadequate flow
  • Verify your spa uses a 48Y frame motor — measure bolt pattern and overall motor length before ordering
  • Check that your plumbing unions match the inlet and discharge port sizes on this pump
  • Confirm your spa controller supports a two-speed pump on the same pump circuit
  • Note whether your existing pump uses 2-inch or other union fittings — mismatched unions require adapters

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

Install difficulty: Medium — Some experience neededTypically 45-90 minutes

What's in the box

  • Waterway EX2 pump assembly (motor + wet end)
  • Mounting feet hardware

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 →

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 — 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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