🚦 Harwil Q12DS-3-3-4S-1 Flow Switch – 1 3/8" Probe for 3/4" Plumbing Part #Q12DS-3-3-4S-1 | Inline Flow Detection | Compatible with Pool & Spa Equipment The Harwil Q12DS-3-3-4S-1 is a compact and reliable flow switch engineered for 3/4-inch plumbing lines in pools, spas, and industrial systems. This flow sensor delivers precise and positive mechanical switching, helping to safeguard pumps, heaters, and automation equipment from low- or no-flow conditions. ✅ Key Features: 🛠️ 1 3/8" Probe Length – Optimized for efficient inline installation 💧 3/4" Inline Connection – Designed to fit standard plumbing for pools, spas, and water systems 🔒 Rugged Construction – Built for long-lasting performance in wet, corrosive, or chemically treated environments ⚡ Positive Mechanical Switching – Provides reliable flow detection to prevent equipment damage 🔄 Wide Compatibility – Suitable for pumps, heaters, filters, UV systems, and automation controllers 📦 Typical Applications: Pools, spas, hot tubs Pump and heater protection Automation and safety interlocks 📝 Installation & Maintenance: Install with flow arrow matching system direction. Secure per manufacturer specs. Verify electrical ratings and wiring with your control system before connecting. Periodically inspect and clean the probe to ensure accurate operation. Consult system documentation for troubleshooting and wiring diagrams. 📐 Specifications: Probe Length: 1 3/8 inch Connection: 3/4 inch inline Switch Type: SPDT (Single Pole, Double Throw) Electrical Ratings: 15A @ 125/250 VAC (Confirm with datasheet) Material: Glass-filled polypropylene, stainless steel components 🔎 Compatibility: Works with major pool, spa, and automation brands using 3/4" lines. Always confirm fit and switch configuration with your equipment or technical datasheet. 💡 Why Choose Harwil Q12DS-3-3-4S-1? Trusted for robust, reliable flow detection Easy integration into new or retrofit installations Protects critical equipment by ensuring safe operating conditions 🛠️ Need help or installation advice? Contact our support team or reference the official Harwil datasheet for detailed specifications and wiring guidance.