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Pump Split Nut 0121109015 - Bubbles Supply

Pump Split Nut 0121109015

Part #: 0121109015

$2.62
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this union/fitting

This Magic Plastics pump split nut (part #0121109015) is a genuine OEM union fitting designed for 1-1/2" FBT spa pump connections. Featuring a small flange design with included mounting screws, this split nut ensures a secure, leak-free connection between your spa pump and plumbing system. As an authentic Magic Plastics component, it delivers the exact specifications and quality your spa system requires.

At Bubbles Supply, we guarantee this split nut will fit your Magic Plastics pump perfectly, backed by our exact fit guarantee and comprehensive 1-year warranty. Orders ship same-day when placed before our cutoff time, getting your spa running faster. The included screws and precision-molded threads make installation straightforward – simply align the union halves, tighten the screws evenly, and ensure proper thread engagement for optimal seal performance.

Exact part number

0121109015

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • FBT split nut
  • pump collar nut
  • pump union nut
  • split union nut

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

Technical specifications

Union size
1-1/2 inch FBT

Plumbing notes

  • Union size: 1-1/2 inch FBT

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
  • Cracked or broken split nut causing drip or spray leak
  • Split nut won't tighten or hold pressure
  • Visible stress cracks around pump union collar
  • Leaking after pump replacement or replumbing

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

Before you buy — quick checklist

  • Confirm your existing pump union body is Magic Plastics — this split nut is OEM and designed to mate with Magic Plastics union bodies
  • Verify your pump plumbing connection is 1-1/2 inch FBT (female pipe thread) before ordering
  • Inspect the union body (the half glued to your plumbing) for damage — if the body is cracked, you may need a full union assembly, not just the split nut
  • Check that the small flange design matches your existing nut — some pumps use a large flange variant
  • Confirm mounting screw holes are intact on the pump volute before installing

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 (1-1/2 inch FBT, small flange)
  • Mounting 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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