Since 1945, Sealed Unit Parts Co., Inc., (SUPCO) has been an innovative leader in the HVACR and Appliance parts industries. We design, manufacture and distribute high-performing parts, supplies, test instruments and tools. SUPCO’s engineers invented the patented Bullet® Line Tap valve, discovered the PTC technology behind two-wire AC and refrigeration hard start kits and manufactured the first ever electronic vacuum gauge in the 1990s. Our product development team and in-house engineers continue that tradition with designs informed by years of hands-on trade experience.