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1-1/2" MBT Union N03000113 - Bubbles Supply

1-1/2" MBT Union N03000113

Part #: N03000113

$7.90
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 LX 1-1/2" MBT union (part N03000113) connects plumbing lines on LX spa pumps, specifically designed for LX 48WTC pump models. The male buttress thread fitting ensures a secure, leak-proof connection in your spa's circulation system. As an OEM LX component, this union maintains the exact specifications and quality standards of your original equipment.

At Bubbles Supply, we guarantee this union will fit your LX pump perfectly with our exact fit promise. Every order ships same-day from our Canadian warehouse and includes our comprehensive 1-year warranty for complete confidence in your repair. When installing, ensure threads are clean and hand-tighten plus one-quarter turn with a strap wrench to prevent over-tightening the plastic threads.

Exact part number

N03000113

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 1.5 inch MBT union
  • LX 48WTC union fitting
  • LX pump union
  • male buttress thread union

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

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:

  • Active leak at pump inlet or outlet union
  • Water seeping around pump plumbing connection
  • Cracked or cross-threaded union causing pressure loss
  • Spa losing water overnight due to failed union seal
  • Low flow caused by collapsed or degraded union body

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

Before you buy — quick checklist

  • Confirm your pump model is the LX 48WTC — this union is designed specifically for that series
  • Verify your existing union is 1-1/2 inch MBT (male buttress thread) before ordering
  • Inspect the union body and tail piece separately — this listing is for the union fitting only, not a complete union kit
  • Check whether the leak is at the union itself or at the o-ring seat — a new o-ring may resolve the issue without replacing the full union
  • Ensure plumbing lines can be temporarily shut off or drained before beginning the swap

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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