Steven Levy Enterprises buys and sells new, unused, and used industrial surplus non-metallic valves. Browse our inventory of non-metallic valves available for purchase. Non-metallic valves are typically made of thermoplastics or composite and reduce stress on the piping system. One major benefit of non-metallic valves is the resistences to external corrosion. Tell us what surplus non-metallic valves you have for sale or call us at 713-910-4337.