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1-1/2" MBT x 1-1/2" MPT Tailpiece 31-3543 - Bubbles Supply

1-1/2" MBT x 1-1/2" MPT Tailpiece 31-3543

Part #: 31-3543

$8.28
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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Fits these systems

Hydro Air

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

Before you buy — quick checklist

  • Confirm your existing tailpiece is 1-1/2" MBT on one end and 1-1/2" MPT on the other — do not assume both ends are the same thread type
  • Inspect the mating union nut and body for wear or damage before reinstalling — replace if needed
  • Verify thread pitch on your current tailpiece matches before ordering
  • Check that the jet body or manifold accepting the MPT end is also 1-1/2" FPT
  • Confirm this is a genuine Hydro Air system — fitment is OEM-specific

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

Exact part number

31-3543

Save this for ordering or warranty claims

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:

  • Persistent leak at jet body plumbing connection
  • Cracked or stripped tailpiece causing water loss
  • Crossed or damaged threads preventing proper union seating
  • Loose or weeping fitting at manifold connection
  • Jet assembly pulling free from plumbing under pressure

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

About this union/fitting

This 1-1/2" MBT x 1-1/2" MPT tailpiece (31-3543) is a genuine Hydro Air OEM plumbing component designed for spa jet assemblies and plumbing connections. The union-style design with male buttress thread on one end and male pipe thread on the other ensures secure, leak-free connections in your spa's water circulation system.

Built to Hydro Air's exact specifications, this tailpiece delivers the precise fit and durability your spa requires. At Bubbles Supply, we guarantee an exact fit for your application and back every part with our comprehensive 1-year warranty. Orders ship same-day to get your spa running quickly. When installing, hand-tighten the union connection first, then use appropriate thread sealant on the MPT end before final assembly to prevent leaks.

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.

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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