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3" Heater Nut 42-2334B-K - Bubbles Supply

3" Heater Nut 42-2334B-K

Part #: 42-2334B-K

$44.05
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

The HydroQuip 3" Heater Nut 42-2334B-K is an OEM replacement uni-nut and retainer assembly designed for HydroQuip heating systems in residential spas and hot tubs. This genuine HydroQuip component ensures proper heater element mounting and secure connection within your spa's heating assembly. The 3-inch sizing makes it compatible with standard HydroQuip heater configurations commonly found in many spa brands.

When you order from Bubbles Supply, you get an exact fit guarantee with this authentic HydroQuip part, plus same-day shipping and our comprehensive 1-year warranty for complete peace of mind. Our OEM parts deliver the reliability your spa deserves, helping resolve common heater hold (HH) and overheat (OH) issues. Always verify your existing heater nut size and HydroQuip model number before installation to ensure proper fitment and optimal heating system performance.

Exact part number

42-2334B-K

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 3-inch heater locknut
  • heater element nut
  • heater retainer nut
  • heater uni-nut

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:

  • HH (heater hold) fault code on spa topside
  • OH (overheat) fault code on spa controller
  • Heater element loose or rattling in manifold
  • Water leaking from heater element connection
  • Inconsistent heating due to poor element contact
  • Heater assembly won't pressurize correctly

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

Before you buy — quick checklist

  • Confirm your existing heater nut measures 3 inches before ordering — do not assume
  • Verify this is a HydroQuip heater assembly, not a competing brand with similar sizing
  • Inspect the heater tube threads for damage before installing a new nut — a stripped tube won't hold
  • Check whether your existing nut failure caused any damage to the heater element itself
  • Confirm your spa is de-energized and water is drained to the heater before attempting removal

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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