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Union Nut 415-5000 - Bubbles Supply

Union Nut 415-5000

Part #: 415-5000

$6.25
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this union/fitting

The Waterway Union Nut 415-5000 is a 2" FBT (female buttress thread) plumbing connection designed for Waterway spa systems and compatible hot tubs. This OEM union nut creates secure, leak-proof connections in your spa's plumbing network, allowing for easy maintenance access while maintaining system integrity.

Engineered to Waterway's exact specifications, this union nut delivers the precise fit your spa requires for optimal performance. At Bubbles Supply, we guarantee an exact fit for your system, backed by our comprehensive 1-year warranty and same-day shipping on orders placed before our daily cutoff. Before installation, verify your existing union size and thread type to ensure proper compatibility with your spa's plumbing configuration.

Exact part number

415-5000

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-inch union nut
  • FBT union nut
  • hot tub union nut
  • spa union nut
  • union nut

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

Technical specifications

Union size
2 inch
Port type
2" FBT (female buttress thread)

Plumbing notes

  • Union size: 2 inch
  • Port type: 2" FBT (female buttress thread)

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:

  • Visible water leak at union connection
  • Union nut cracked or split
  • Union nut threads stripped or cross-threaded
  • Unable to fully tighten union connection
  • Water weeping at pump or equipment connection point

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

Before you buy — quick checklist

  • Confirm your existing union nut is 2" FBT — not all Waterway unions use the same thread type or size
  • Inspect the mating union body to ensure threads are intact and undamaged before replacing only the nut
  • Verify whether you need the full union assembly or just the nut — this listing is for the nut only
  • Check that the union body (sold separately) is also Waterway-compatible to ensure a proper seal
  • Have a replacement O-ring on hand — the O-ring seats between the union halves and should be replaced any time the union is disassembled

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

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

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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