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"ACTUAL SIZE" for barb-size 1/2"inch, 0.522"= USA Premium Quality 1/2” Check Valve Posi-Seal Anti-Back Flow= This high Performance anti-leak check valve will solve your back-flow problems, install it and forget it! Its high strength super advanced “PTFE” solid ball and a“Viton/FKM”-“O-Ring" encased by a Brass durable body that can withstand operating pressures of up to 280 psi and high temperatures of up to 380 Degree-F. "All time highest ratings in its Class". Perfect solution for conditions in-line where Plastic, Aluminum or copper that affects or compromises the quality/condition of fluid flowing. Engineered Dynamic Design Called “Max-Flo-Chek” tm.= This design allows for maximum flow in-line, when positive moving fluid flow occurs, the ball moves freely to a center cavity away from sealing “O” ring allowing for maximum flow all around the ball with zero fluid resistance. On an instant, negative movement or reverse fluid flow occurs, fluid pushes ball back into its posi-seal “O” ring for a solid stop! In this innovative dynamic design there are no, hinged parts, flaps, screws, springs, diaphragms to restrict flow, or malfunction. It may be used in VERTICAL configuration. Piece Of Mind= With your “I flow check valve” in-line, you can feel confident your fluid will remain in a "one-way" flow, or boats will stay primed to start in the middle of a lake, keep out unwanted water from your hull thru your bilge pump. Emergency Generators will keep fuel primed ready in a moments notice to start. Motorcycles, ATVs will stay primed ready to start. Fish Aquariums won't drain in an Elec power loss. Household Domestic Safe = Can be safely used in potable H2O syst, fish aquarium filter pumps, hydronic floor heating sys, microbrew, recirculating pumps, hydroponics grow pumps, heating fluids, antifreeze fluids, reclaimed H2O and many mild oils/chemicals. Versatile check valve.