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Pump Split Nut 0121109025 - Bubbles Supply

Pump Split Nut 0121109025

Part #: 0121109025

$9.02
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 Magic Plastics Pump Split Nut 0121109025 is an essential plumbing component designed for spa pump unions with 2-1/2" FBT connections. This OEM replacement part features a small flange design with included screws, ensuring a secure and watertight seal between pump sections. Built to Magic Plastics' exacting standards, this split nut maintains the reliable connection your spa's circulation system depends on.

At Bubbles Supply, we guarantee this split nut will deliver an exact fit for your Magic Plastics pump system. Every order ships same-day and includes our comprehensive 1-year warranty for complete peace of mind. Whether you're performing routine maintenance or emergency repairs, this genuine OEM component restores your spa's performance to factory specifications. Verify your existing split nut's thread size and flange configuration before installation to ensure proper fit and optimal seal integrity.

Exact part number

0121109025

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 2.5 inch split nut
  • pump union split nut
  • pump union tail piece nut
  • union half nut

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

Technical specifications

Union size
2-1/2 inch FBT (Female Buttress Thread)

Plumbing notes

  • Union size: 2-1/2 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:

  • Union joint leaking at pump inlet or outlet
  • Water dripping at pump connection under load
  • Cracked or broken split nut causing seal failure
  • Split nut won't tighten or hold pressure
  • Spin-off or stripped nut threads causing joint failure

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

Before you buy — quick checklist

  • Confirm your existing union is 2-1/2" FBT — measure the thread diameter and count threads before ordering
  • Verify your union uses a small flange configuration, not a large flange
  • Inspect the union body and o-ring seat — if cracked, the full union assembly may need replacement, not just the split nut
  • Check that screw holes and split nut tabs on the mating half align with this OEM Magic Plastics design
  • Do not assume fitment based on pipe size alone — FBT thread pitch and flange style must match

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

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

What's in the box

  • Split nut (2-piece half)
  • Retaining screws

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

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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