🚀 New launch promo — 10% off orders over $300. Use code LAUNCH10
Bubbles Supply
Not sure which part you need? Upload a photo and we'll find it. →
2" FBT Union Nut 91431150 - Bubbles Supply

2" FBT Union Nut 91431150

Part #: 91431150

$7.28
In stock — ships today
Qty
🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
Add to B2B order list

Not sure this fits?

Send us a photo of your old part — we'll confirm the right replacement before you order.

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

About this union/fitting

This 2" FBT Union Nut (part #91431150) is an OEM replacement component designed for Aqua-Flo by Gecko main pump systems in hot tubs and spas. The union nut creates a secure, watertight seal at the 2-inch female buttress thread (FBT) connection point, allowing for easy pump maintenance and removal without cutting plumbing lines.

Built to Aqua-Flo's exact OEM specifications, this union nut ensures perfect fitment and reliable performance in your spa's circulation system. At Bubbles Supply, we guarantee an exact fit for your pump setup, and every order ships the same day with our comprehensive 1-year warranty for complete peace of mind. Before installation, verify your existing union connection is 2" FBT threading to ensure proper compatibility with your Aqua-Flo pump configuration.

Exact part number

91431150

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
  • Female Buttress Thread Union Nut
  • Pump Union Nut
  • Union Nut

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

Technical specifications

Union size
2 inch FBT (Female Buttress Thread)

Plumbing notes

  • Union size: 2 inch 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:

  • Water leaking at pump union connection
  • Union nut cracked or stripped threads
  • Unable to reseat union after pump removal
  • Union weeping at plumbing connection under pressure
  • Visible damage or cross-threading on existing union nut

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

Before you buy — quick checklist

  • Confirm your existing union connection is 2-inch FBT — not all Aqua-Flo unions use the same thread type or size
  • Inspect the union body and tailpiece as well — a damaged nut often means the mating surfaces need inspection too
  • Check whether the leak is at the nut or the O-ring before ordering — you may need a replacement O-ring alongside this part
  • Verify this is the nut (rotating threaded collar) and not the union body or tailpiece
  • Confirm the OEM part number on your existing union or pump documentation matches 91431150

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.

🔒 Secure checkout · SSL encrypted·🇺🇸🇨🇦 Serving the US and Canada·↩️ 30-day hassle-free returns·📦 Same-day fulfillment