With the Kum Keeper, your hole ready and open for deposits. The outer piece is a classic grommet plug made of flexy premium silicone. Its tapered head ensures EZ entry and gets you open and feeling FULL. The removable stopper allows you to FILL UP with lube...or more. Connect a funnel, nozzle, or tube. And when you are ready, CORK IT. You won't spill a drop.