Our exclusive one-piece poppet, along with other key design features, yields numerous advantages over ordinary check valves. You won’t find O-rings in our products! After assembly, each valve is tested to ensure casting integrity and backflow prevention; only then is it branded with the Strataflo name—your assurance of quality. Beginning in 1939, Strataflo became known for the performance of our innovative and durable rubber poppet. This unique, patented design earned the respect of military engineers, pump manufacturers and well professionals alike. Strataflo then designed a metal poppet to solve the problem with metal-to-metal seals. This unique, precision-machined innovation also became a success—this time in oil, gas and steam applications. These core innovations, along with over 80 years of precise manufacturing and rigorous testing practices, are what have made us a recognized brand with a premium reputation.