16" Spin Lid w/ 4" removable center.
This 16" Lid w/ 4" Center installs quickly with minimal effort and is typically compatible with most tanks. The male-threaded vented lid is manufactured in standard pipe threads with a removable, four-inch center vent cap. Lid ring that screws onto the tank is sold separately. You can secure the female threaded lid ring to the tank and then thread the lid in.