A filter/regulator is an air filter and air regulator, all-in-one. These units can remove solid and liquid contaminants from the air, while providing controlled air pressure. An air compressor regulator or air pressure regulator can be used for instrumentation, filtration, refrigeration, and pneumatic applications. So if your compressor is not providing enough pressure, a new filter-regulator could provide more pumping power. Zoro also has a great selection of pressure gauges too.