Profile: Proco Products, Inc. specializes in the design and manufacture of piping/ducting system expansion joints. We offer a wide range of rubber & molded PFA expansion joints, fabric fan connectors, braided flexible hose assemblies and low torque sealing gaskets for piping industry. Our rubber check valves offer exceptional back flow prevention with as little as 1" of head pressure to allow flow. They are manufactured completely of rubber with top quality fungicide and barnacle resistant rubber being selected for use. It is therefore impervious to the daily operational vulnerability affiliated with the water and sewage industry such as rust, freezing, corrosion and seizing often found in the check valve industry.