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2" MBT x 2" S Tailpiece 91431350 - Bubbles Supply

2" MBT x 2" S Tailpiece 91431350

Part #: 91431350

$11.07
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this union/fitting

This 2" male buttress thread (MBT) x 2" slip tailpiece is an essential union component for Aqua-Flo by Gecko main pump systems. Designed to connect your pump to the spa plumbing system, this OEM tailpiece ensures a secure, leak-free connection between the pump discharge and your spa's return line. The 2" sizing accommodates standard spa circulation systems, while the slip connection allows for easy plumbing integration.

At Bubbles Supply, we guarantee this Aqua-Flo tailpiece will be an exact fit for your pump system, backed by our 1-year warranty and same-day shipping commitment. Note that this tailpiece does not include an O-ring groove, so ensure you have the proper gasket or thread sealant for installation. Always verify your existing tailpiece dimensions and thread type before ordering to ensure proper fitment with your current pump configuration.

Exact part number

91431350

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 2-inch MBT tailpiece
  • 2" slip tailpiece
  • pump discharge tailpiece
  • pump union tailpiece
  • union tail piece

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:

  • Active water leak at pump union connection
  • Union tailpiece cracked or visibly damaged
  • Stripped or cross-threaded MBT union threads causing drip at pump
  • Slow drip at pump discharge that worsens under pressure
  • Flow restriction caused by deteriorated or deformed tailpiece bore

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

Before you buy — quick checklist

  • Confirm your existing tailpiece is 2" MBT (male buttress thread) on the pump side — buttress thread is not interchangeable with standard NPT or acme threads
  • Verify the plumbing side is 2" slip (socket) connection, not threaded
  • This tailpiece does NOT include an O-ring groove — confirm your union uses a flat gasket or thread sealant, not an O-ring seated in the tailpiece itself
  • Check the part number printed or molded on your existing tailpiece before ordering — Aqua-Flo unions use matched components and mixing incompatible parts can cause leaks
  • Inspect the corresponding union nut and body for damage while the system is drained — replace the full union assembly if other components show cracking or thread wear

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

Install difficulty: Medium — Some experience neededTypically 30–60 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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