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Tecmark Pressure Switch 3505 - Bubbles Supply

Tecmark Pressure Switch 3505

Part #: 3505

$74.39
In stock — ships today
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🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this pressure switch

The Tecmark 3505 Pressure Switch is a SPDT (Single Pole Double Throw) pressure control component designed for spa and hot tub chemical systems. This OEM-quality switch features 1/8" NPT threading and handles up to 5 amps, making it compatible with most residential spa applications requiring precise pressure monitoring and control.

Built to Tecmark's proven standards, this pressure switch delivers reliable performance for chemical dosing systems and automated spa functions. At Bubbles Supply, we guarantee an exact fit for your spa with our 1-year warranty backing every purchase. Need it fast? We ship same-day to get your spa running again quickly. Before installation, verify your existing switch specifications match the 1/8" NPT connection and 5-amp rating to ensure proper compatibility with your spa's control system.

Exact part number

3505

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • pressure switch SPDT
  • spa pressure switch 1/8 NPT
  • Tecmark 3505

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

Technical specifications

Amperage
5A
Port type
1/8" NPT

Plumbing notes

  • Port type: 1/8" NPT

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:

  • Chemical dosing system not activating
  • Spa automation not responding to water flow
  • Chemical feeder running continuously without shutoff
  • Pressure-dependent functions not triggering
  • Spa controller showing pressure fault or error

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

Before you buy — quick checklist

  • Confirm your existing switch is 1/8" NPT threaded — measure or check the old switch label
  • Verify your system requires a SPDT (Single Pole Double Throw) configuration, not SPST
  • Check the amp draw of the circuit this switch controls — must be 5A or under
  • Note the pressure set point of your current switch and confirm the 3505 matches your application
  • Inspect the existing port for corrosion or thread damage before ordering

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

Install difficulty: Medium — Some experience neededTypically 20-45 minutes

What's in the box

  • Tecmark 3505 pressure switch
  • Wiring terminals (integrated)

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year 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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