1/2" FNPT x 1/2" FNPT Polypropylene Check Valve w/FKM Seals | 1/3 PSI Cracking Pressure & Hastelloy Spring

Product Description Built for reliability and versatility, the 1/2" 685 Series Check Valve is ideal for a wide range of air and fluid applications, making it a top choice for soft wash systems and power washing rigs. Featuring a durable polypropylene body, FKM seals, and a Hastelloy spring, this valve is designed for corrosion resistance, chemical compatibility, and long-term performance. Its high flow rate and positive sealing at low back pressure ensure smooth, efficient operation—even under light vacuum conditions. Key Features: 💧 Material: Polypropylene body with FKM seals ⚙️ Spring: Hastelloy for chemical resistance 🚿 High flow rate for optimal performance 🔁 O-ring poppet mechanism ensures reliable check action ✅ Cracking pressure: Only 1/3 psi for quick response 🔒 Positive seal at very low back pressure or slight vacuum 🔧 Seat area open diameter: 0.438" 📈 Max pressure: 125 PSI 🌡️ Max temperature: 140°F Whether you're upgrading your rig or building a custom system, this check valve delivers the durability and performance you can count on.