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Pump Union 400-5570 - Bubbles Supply

Pump Union 400-5570

Part #: 400-5570

$15.47
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 Pump Union 400-5570 is a premium 2-inch plumbing connection designed for spa circulation and jet pumps. This OEM union features a 2" FBT (female buttress thread) to 2" slip connection with included O-ring for reliable, leak-free performance in residential and commercial spa applications.

Engineered to Waterway's exacting standards, this pump union delivers the exact fit you need to maintain your spa's circulation system. At Bubbles Supply, we guarantee this is the precise OEM replacement for your existing union, backed by our 1-year warranty and same-day shipping on in-stock orders. The included O-ring ensures proper sealing when installed correctly. Always verify thread type and measurements match your existing union before installation, and apply appropriate thread sealant to threaded connections for optimal performance.

Exact part number

400-5570

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-inch pump union
  • 2" FBT union
  • plumbing union
  • Pump union
  • slip union fitting

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

Technical specifications

Union size
2 inch

Plumbing notes

  • Union size: 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 visibly damaged
  • Spa losing water pressure due to failed union seal
  • O-ring blown out causing active drip or stream at pump plumbing joint
  • Union body stripped or cross-threaded and cannot seal properly

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

Before you buy — quick checklist

  • Confirm your existing union is 2" FBT (female buttress thread) — buttress thread is NOT the same as standard pipe thread
  • Verify the mating connection on your pump is 2" slip (glue fitting), not threaded
  • Inspect both halves of the union — this listing covers the union body; confirm whether you also need the pump side tail piece
  • Check that your existing union is a Waterway OEM part — aftermarket unions may use different thread profiles that won't mate correctly
  • Measure your current union before draining the spa to confirm size match

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

Install difficulty: Medium — Some experience neededTypically 30-60 minutes

What's in the box

  • Pump union body (400-5570)
  • O-ring (pre-included)

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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