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MP6 ST1 Overlay X509318 - Bubbles Supply

MP6 ST1 Overlay X509318

Part #: X509138

$19.05
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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Also replaces

X509318
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this topside/keypad

The MP6 ST1 Overlay X509318 is a genuine OEM lighting control overlay designed for Master Spa hot tubs equipped with MP6 ST1 Twilight control systems. This replacement overlay restores the illuminated control panel that manages your spa's lighting features, ensuring your relaxation sessions continue with the perfect ambiance.

At Bubbles Supply, we guarantee this overlay will fit your Master Spa exactly as intended, backed by our comprehensive 1-year warranty. Your replacement overlay ships the same day when ordered before our cutoff, getting your spa lighting controls back to full operation quickly. Remember to power down your spa completely before installing any electrical components, and verify your existing overlay matches the MP6 ST1 configuration before ordering.

Exact part number

X509138

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • MP6 lighting overlay
  • MP6 ST1 control overlay
  • spa topside overlay
  • Twilight control panel overlay
  • X509318

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

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Overlay buttons no longer illuminate
  • Backlit labels are faded or unreadable
  • Control panel graphics are peeling or cracked
  • Physical overlay is warped, discolored, or water-damaged
  • Buttons are sticking due to overlay delamination

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

Before you buy — quick checklist

  • Confirm your control system is the MP6 ST1 Twilight — not all MP6 variants use the same overlay
  • Physically compare your existing overlay layout to product images before ordering
  • Check that your topside control unit itself is functional — this overlay does not repair underlying electronics
  • Verify part number X509318 appears on your existing overlay or control system documentation
  • Inspect the topside housing for cracks or damage that may require additional parts beyond the overlay

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.

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