APCO 145C Iron Threaded Combination Air Valve

APCO 145C is a 2-inch, ductile iron, combination air valve with threaded 2 in NPT inlet and outlet, designed for automatic air release and air–vacuum management in water pipelines. As a combination air valve, it vents trapped air during pipeline filling and admits air during vacuum events, helping to prevent air pockets, flow fluctuations, and potential water hammer. The 145C is part of APCO's single-body valve family and is available in 1–4 inch sizes, with ductile iron bodies and threaded NPT connections to match common piping configurations. Common installation contexts include water distribution mains and other clean-water systems where reliable air management supports steady flow and protects downstream equipment.