Harwil Q-12DS-C2/SUND860 Flow Switch W 3/4" Chamber, 3/4"bx3/4"bx3/8"b Tee, 2P, Generic, OEM

Harwil Q-12DS-C2/SUND860 flow switch designed for Sundance spa systems from 1999 to present. Features a transparent tee with 3/4" barb connections and 3/8" side barb for reliable water circulation monitoring. Compatible with 2-pump and 3-pump configurations, plus 2001+ 1-pump Capri systems. Fits Sundance 800/850/880 series, Sweetwater, Portofino, and J-300 LCD models (2002+). If your spa displays a flashing or solid "Flo" error code, this replacement switch may resolve circulation issues caused by defective flow detection. Ensure proper filter maintenance and pump function for optimal performance.

💧 Harwil Flow Switch – Model Q-12DS-C2/SUND860

With 3/4" Chamber & Tee | 2-Pole | OEM-Grade Generic Replacement

The Harwil Q-12DS-C2/SUND860 is a high-quality flow switch assembly designed for use in pool, spa, and water heating systems requiring dependable flow detection. This model includes a 3/4" flow chamber, a 3/4"bx3/4"bx3/8"b tee, and a 2-pole switch—ideal for activating heaters or other equipment only when safe water flow is present.

✅ Product Features:

• 3/4" Flow Chamber – Compact and compatible with standard plumbing setups

• 3/4"bx3/4"bx3/8"b Tee – Ensures easy inline installation with included fittings

• 2-Pole Mechanical Switch – Reliable open/close circuit detection for flow-dependent devices

• OEM-Equivalent Quality – Matches performance and fit of original Harwil and SUND860 models

• Corrosion-Resistant Construction – Built for chlorinated, brominated, or freshwater systems

🔧 Common Applications:

• Pool & spa heaters (flow protection switch)

• UV systems and salt generators

• Water features or fountains

• Booster pump and circulation systems

⚠️ Why It Matters:

Using a flow switch like the Q-12DS-C2 ensures your equipment:

• Only activates when water is flowing properly

• Prevents dry-firing of heaters

• Enhances system safety and longevity

🛠 Premier Pool & Spa stocks flow switches and installation accessories for residential and commercial systems. Not sure if this model is right for your setup? Our techs can help match and install the correct part.