🚀 New launch promo — 10% off orders over $300. Use code LAUNCH10
Bubbles Supply
Not sure which part you need? Upload a photo and we'll find it. →
3/4" Barb Flow Switch 34-0221 - Bubbles Supply

3/4" Barb Flow Switch 34-0221

Part #: 34-0221

$216.72
In stock — ships today
Qty
🔒 Secure checkout↩️ 30-day returns✅ 1-year warranty
Add to B2B order list

Not sure this fits?

Send us a photo of your old part — we'll confirm the right replacement before you order.

Upload a Photo
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this flow switch

The HydroQuip 3/4" Barb Flow Switch (34-0221) is an OEM replacement sensor designed for HydroQuip spa control systems. This clear tee-style flow switch features 3/4" barb connections and monitors water flow to ensure your spa's heating and safety systems operate correctly. When water flow drops below the required threshold, this sensor signals the control system to prevent dry heating conditions that could damage your spa's equipment.

Built to HydroQuip's original specifications, this flow switch delivers an exact fit guaranteed for seamless integration with your existing plumbing. We ship same-day for orders placed before our cutoff time, and every part comes backed by our comprehensive 1-year warranty for complete peace of mind. Professional installation is recommended to ensure proper orientation and secure barb connections in your spa's circulation system.

Exact part number

34-0221

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 3/4 inch barb flow switch
  • clear tee flow switch
  • HydroQuip flow switch
  • tee-style flow switch

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:

  • Spa displays HH, OH, or ICE error codes
  • Heater won't activate despite pump running
  • Spa shuts down shortly after startup
  • Control system not detecting water flow
  • Spa intermittently drops out of heat mode
  • False low-flow or no-flow fault codes

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

Before you buy — quick checklist

  • Confirm your spa control system is a HydroQuip unit — this is an OEM part
  • Verify your existing flow switch uses 3/4" barb fittings, not threaded or union-style connections
  • Inspect the clear tee body of your current switch — replace if cracked, discolored, or leaking
  • Check that the paddle or reed mechanism inside the old switch is the failure point before ordering
  • Note the orientation arrow or flow direction marking on your existing switch before removal

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

Install difficulty: Medium — Some experience neededTypically 30–60 minutes

What's in the box

  • 3/4" barb tee-style flow switch (34-0221)
  • Electrical leads for control board connection

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

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.

🔒 Secure checkout · SSL encrypted·🇺🇸🇨🇦 Serving the US and Canada·↩️ 30-day hassle-free returns·📦 Same-day fulfillment