<b>WARNING! Attention to "ACTUAL SIZE" for barb-size 22/23"inch. Smaller than 3/4"inch, (3/4" is USA Category Size)=</b><br>Premium USA Quality 3/4”inch Check Valve Posi-Seal Anti-Back Flow=</b><br>This high performance anti-leak ball 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 poly-alloy durable plastic that can withstand operating pressures of up to 80psi and high temperatures of up to 200F. "All time highest ratings in its Class". Perfect solution for conditions in-line where Brass, Aluminum and copper create corrosion conditions that affects or compromises the quality of fluid flowing.<br><b>Engineered Dynamic Design Called “Max-Flo-Chek” tm.=</b><br>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 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 flaps, pins, screws, springs, diaphragms, rubber to restrict flow, malfunction, break or contaminate. It may be used in vertical or horizontal configuration.<br><b>Piece Of Mind=</b><br>With your “I flow check valve” in-line, you can feel confident your spa will flow at full speed for your enjoyment, your boat will stay dry keeping out any unwanted water from your hull thru your bilge pump. Fish Aquariums won't drain in an Electric power loss.<br><b>Household Domestic Safe =</b><br>Can be safely used in potable h2o systems, fish aquarium filter pumps, hydronic floor heating sys, recirculating pumps, hydroponics grow pumps, heating fluids, antifreeze fluids, reclaimed H2O and many mild oils/chemicals. All around versatile check valve. Valvula de retencion de agua ,plastico.