Plastic Drain Valve

drain valve
A valve located at the bottom of a spill container to drain accumulated liquid into the UST.  Drain valves, depending on the type, may be activated by pulling a chain, pushing a rod, or pulling a lever.
A plastic or brass valve located near the bottom of the water heater that allows the tank to be drained when the water heater needs to be replaced and also permits periodic partial draining by the homeowner to flush out sediments that may have accumulated in the bottom of the tank.
Device designed to allow drainage of stored contents from a water heater.

plastic
fictile: capable of being molded or modeled (especially of earth or clay or other soft material); "plastic substances such as wax or clay"
generic name for certain synthetic or semisynthetic materials that can be molded or extruded into objects or films or filaments or used for making e.g. coatings and adhesives
Credit cards or other types of plastic card that can be used as money
capable of being influenced or formed; "the plastic minds of children"; "a pliant nature"
A synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be molded into shape while soft and then set into a rigid or slightly elastic form