JB uses the most premium level of C360 and C370 brass. This gives our brass fittings and access valves high tensile strength while resisting corrosion. Because we machine under one roof in our Aurora, IL factory, JB can control and ensure that you will consistently have quality fittings and valves. JB takes pride in our US manufacturing facility and we machine to the strict guidelines of the AHRI to ensure proper sealing of the valve and core surfaces. Many of our competitors’ import fittings that use lower quality brass with lower copper content, resulting in higher failure rates.