American Standard Exposed, Top Spud, Automatic Flush Valve, For Use With Category Urinals, 0.5 Gallons per Flush 6063051.002 Nominal Size 16" X 31" X 1.5" Free floating ball and chain assembly Free floating ball and chain assembly resists being damaged by livestock Bathroom stall door includes patented patented permaseal seamless design providing patented permaseal seamless design provides superior door integrity against water penetration to stop doors rusting from the inside Automatic flush valves are sensor operated valves for flushing tankless toilets and urinals Their sensor automatically triggers flushing after a set time period or once a user has moved out of sensing range