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Tecmark Pressure Switch 3902 - Bubbles Supply

Tecmark Pressure Switch 3902

Part #: 3902

$46.14
In stock — ships today
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About this pressure switch

The Tecmark 3902 pressure switch is a reliable SPST (single pole, single throw) replacement component designed for spa and hot tub chemical feed systems. This precision switch operates at 1-5 PSI pressure range with 1 amp capacity, making it ideal for controlling chemical pumps and related equipment in residential and commercial spa installations.

Built to Tecmark's exacting OEM standards, this pressure switch delivers the exact fit and performance your spa system requires. At Bubbles Supply, we guarantee precise fitment and back every Tecmark 3902 with our comprehensive 1-year warranty. Most orders ship same-day, getting your spa back to optimal operation quickly. Before installation, verify your existing switch's pressure range and electrical specifications match the 1-5 PSI operating parameters and 1 amp rating to ensure proper system function.

Exact part number

3902

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • pressure switch 3902
  • spa chemical feed pressure switch
  • SPST pressure switch
  • Tecmark 3902

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

Technical specifications

Amperage
1A

Common symptoms this part fixes

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

  • Chemical feeder pump not activating
  • Spa sanitizer levels inconsistent despite functioning chemical pump
  • Chemical dosing pump runs continuously without shutting off
  • No chemical injection when jets are running
  • System fails to trigger chemical feed on pressure change

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

Before you buy — quick checklist

  • Confirm your existing pressure switch is rated 1–5 PSI — this switch is not adjustable outside that range
  • Verify the switch is SPST (single pole, single throw) — do not substitute for DPDT or other configurations
  • Check the amperage draw of your chemical feed pump does not exceed 1 amp
  • Inspect the port size and thread type on your current switch to confirm physical fitment before ordering
  • Confirm this switch is used in a chemical feed circuit, not a primary jet pump or heater pressure switch application

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

Install difficulty: Medium — Some experience neededTypically 20–45 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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