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Pump Union 400-2160 - Bubbles Supply

Pump Union 400-2160

Part #: 400-2160

$20.82
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this union/fitting

The Waterway 400-2160 Pump Union is a self-aligning plumbing connector designed for Jacuzzi spa pumps with 1-1/2" connections. This OEM union features a 1-1/2" female buttress thread (FBT) on one end and 1-1/2" slip fitting on the other, providing a secure, watertight seal between your pump and plumbing system. The self-aligning design eliminates the guesswork during installation, ensuring proper thread engagement every time.

Built to Waterway's exacting OEM standards, this pump union delivers the exact fit guaranteed for reliable long-term performance. Ships same-day from our Canadian warehouse and includes our comprehensive 1-year warranty for complete peace of mind. The union's durable construction withstands spa chemicals and temperature cycles while maintaining leak-free operation. Verify your existing union measurements before ordering to ensure proper fitment with your spa's plumbing configuration.

Exact part number

400-2160

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 1-1/2 inch pump union
  • FBT union
  • plumbing union
  • pump union
  • spa pump union

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

Technical specifications

Union size
1-1/2 inch

Plumbing notes

  • Union size: 1-1/2 inch

Need help measuring? Email hello@bubblessupply.com with a photo of your existing plumbing.

Common symptoms this part fixes

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

  • Water leaking at pump inlet or outlet connection
  • Union cracked or broken from freeze damage or impact
  • Stripped or cross-threaded union threads causing drip leak
  • Union body warped or distorted from heat exposure
  • O-ring seat damaged preventing watertight seal

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

Before you buy — quick checklist

  • Confirm your existing union is 1-1/2 inch — measure the pipe OD before ordering
  • Verify the pump-side connection is 1-1/2 inch FBT (female buttress thread), not a slip or MPT fitting
  • Check which end of your union connects to the pump volute versus the plumbing — orientation matters
  • Inspect the mating pump port threads before installing to confirm they are undamaged
  • Have a replacement union O-ring on hand — the existing O-ring should be replaced whenever the union is disturbed

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

Install difficulty: Easy — DIY-friendlyTypically 15-30 minutes

What's in the box

  • Pump union body (400-2160)
  • Union O-ring

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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