Smart Products has introduced the 103 NPT Check Valve as a solution to many check valve mounting issues. Users can thread any plastic or metal manifold and then screw the threaded 103 NPT Check Valve into the manifold. Intended for applications where mounting a check value is difficult, the 103 NPT Check Valve comes with a 1/8in NPT thread size and is available in a choice of materials and opening pressures. The spring-loaded poppet with o-ring seals design offers the ability to precisely specify opening pressures from 0.11 PSI to 20 PSI. This NPT valve can also be ordered in a reverse flow model (109 NPT Check Valve). Check valves are used in applications to restrict the ability of a fluid to flow in one direction (the check direction) while allowing fluid to flow freely in the opposite direction (flow direction).