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Tecmark Pressure Switch 3906 - Bubbles Supply

Tecmark Pressure Switch 3906

Part #: 3906

$44.93
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this pressure switch

The Tecmark 3906 Pressure Switch is a reliable SPST (Single Pole Single Throw) replacement part designed for spa and hot tub chemical feed systems. This 1 amp switch operates within a 1-5 PSI pressure range, making it ideal for controlling chemical pumps and dosing equipment in residential and commercial spa installations.

Built to Tecmark's OEM specifications, this pressure switch delivers the exact fit and performance your spa system requires. At Bubbles Supply, we guarantee an exact fit for your application and ship same-day for orders placed before our cutoff time. Every Tecmark 3906 comes backed by our comprehensive 1-year warranty for complete peace of mind. Before installation, verify your existing switch's pressure rating and electrical specifications to ensure proper compatibility with your spa's chemical system.

Exact part number

3906

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Also known as / Replaces

This part replaces or is interchangeable with:

  • pressure switch for chemical feed
  • spa chemical dosing switch
  • SPST pressure switch 1-5 PSI
  • Tecmark 3906

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 pump not activating when spa is running
  • Chlorine or bromine feeder not dosing
  • Chemical feed system cycling erratically or constantly
  • Dosing pump runs continuously with no shutoff
  • Spa controller showing chemical system fault

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

Before you buy — quick checklist

  • Confirm your existing switch is rated SPST — this switch is not a DPDT replacement
  • Verify your chemical feed system operates within the 1–5 PSI pressure range
  • Check the amperage draw of your chemical pump does not exceed 1 amp
  • Inspect the pressure port fitting size on your existing switch to confirm thread compatibility
  • Note whether your current switch is normally open (NO) or normally closed (NC) — verify 3906 matches your circuit logic

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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