**Hansen Full-Flow valves do not restrict pipe flow when fully open.
Hansen HiFlo check valve is used in-line to stop fluids reverse-flowing in the pipe. The unique Hansen design reduces flow restriction to the minimum. The screw cap allows for easy valve-access for service or replacement of diaphragm and spring. (Replacement diaphragm and spring sets are common to both check valves and foot valves of same dimension.) BSPT thread.