The SMART VALVE™ is made primarily of Acetron GP, an extremely strong, self-lubricating space-age resin. With low, consistent internal stress, this material experiences little dimensional change during use. Acetron GP is also an ideal material for use in wet environments because it resists moisture, will not accumulate particulates, will not corrode and self-seals extremely well eliminating the need for seals and gaskets that would wear out.