This 1 inch two-way universal flow check valve is used in commercial and residential hydronic heating systems to provide positive gravity shutoff when the circulator is not running and prevents the flow of water to radiation units. This valve is easily opened for gravity circulation. It has an iron body, female threaded connections, a combination of angle and horizontal checks, bronze seat, and brass center guide. The maximum pressure is 50 psi (344.8 kPa).