Made from FDA-sanctioned ingredients able to resist extreme temperature variation: -100°F to 500°F. Translucent natural color for visual contact with the flow. Resilient, stretchable, and resistant to compression. Odorless, tasteless and inert. Good electrical and weatherability properties, resists U.V., ozone, gases, and moisture. Certified by the National Sanitation Foundation (NSF-51) for food equipment materials[U].