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Heater Union Tailpiece 417-2090 - Bubbles Supply

Heater Union Tailpiece 417-2090

Part #: 417-2090

$4.70
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 Heater Union Tailpiece 417-2090 is a critical plumbing component that connects your spa heater to the circulation system. This OEM replacement part features 2" male buttress threads (MBT) on one end and 1-1/2" slip fitting on the other, designed to fit Waterway spa heaters across multiple spa brands and models.

Engineered for reliable, leak-free performance, this tailpiece ensures proper water flow through your heating system. At Bubbles Supply, we guarantee this is the exact fit for your Waterway heater with our exact fit guarantee, plus you'll get same-day shipping and a full 1-year warranty for complete peace of mind. Note that the O-ring is sold separately and must be ordered if replacement is needed during installation.

Exact part number

417-2090

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-inch MBT heater tailpiece
  • heater plumbing tailpiece
  • heater union fitting
  • heater union tailpiece

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

Technical specifications

Union size
2 inch heater union (MBT) x 1-1/2 inch slip

Plumbing notes

  • Union size: 2 inch heater union (MBT) x 1-1/2 inch slip

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 heater union connection
  • Cracked or broken heater tailpiece
  • Stripped buttress threads causing drip at heater inlet or outlet
  • Unable to achieve leak-free seal at heater manifold
  • Tailpiece pulled out or separated during heater removal

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

Before you buy — quick checklist

  • Confirm your existing tailpiece has 2-inch male buttress threads (MBT) — not standard NPT threads
  • Verify the opposite end of your current tailpiece is 1-1/2 inch slip, not threaded
  • Check that your heater union nut is compatible with 2-inch MBT before ordering
  • Note that the O-ring is NOT included — order it separately if yours is worn, cracked, or missing
  • Inspect the heater union body itself for damage before replacing only the tailpiece

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

Install difficulty: Medium — Some experience neededTypically 20-45 minutes

What's in the box

  • Heater union tailpiece (417-2090)
  • Note: O-ring sold separately

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

Warranty

1 year 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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