Polyethylene, for use with steel and polyethylene drums. Instant "on" - "off" control provides smooth, fast flow with no dribble. 2" size will empty 55 gallon drums of average material in about 3 minutes. Will handle viscous materials. Do not use above 125°F or in heated container. Not recommended for containers over 55 gallon or any container that fluid level is over 48" high. The 2" size has EPDM gasket. Meets FDA standards.