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1/8" NPT Heater Plug IP-18 - Bubbles Supply

1/8" NPT Heater Plug IP-18

Part #: IP-18

$2.27
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this heater

The HydroQuip 1/8" NPT Heater Plug IP-18 is a genuine OEM replacement plug designed for HydroQuip spa heater assemblies. This durable plastic plug features standard 1/8" NPT threading and serves as a critical seal component in your spa's heating system, preventing water intrusion and maintaining proper heater operation.

At Bubbles Supply, we guarantee this HydroQuip heater plug is an exact fit for your system, and we back every part with our comprehensive 1-year warranty. Orders ship same-day from our Canadian warehouse, getting your spa back to optimal performance quickly. This genuine OEM part ensures reliable sealing and long-term durability compared to generic alternatives. Verify your heater model and threading size before installation to ensure proper fit and performance.

Exact part number

IP-18

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 1/8 NPT pipe plug
  • heater body plug
  • heater manifold plug
  • Heater port plug

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:

  • Water leaking from heater body port
  • Heater losing pressure due to unsealed port
  • OH (overheat) fault triggered by water intrusion near heater
  • HH (heater high-limit) fault caused by improper heater assembly seal
  • Visible weeping or drip from unused heater manifold port

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

Before you buy — quick checklist

  • Confirm your heater body has an open 1/8" NPT port that requires plugging
  • Verify thread type is NPT (tapered) — not NPS (straight) — before ordering
  • Check that existing plug is plastic, not brass, to match OEM spec
  • Inspect the port threads on your heater body for damage or stripping before installation
  • Confirm this is a HydroQuip heater assembly — fitment is specific to HydroQuip units

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

Install difficulty: Easy — DIY-friendlyTypically 5-15 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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