Best used as a surf ski drain plug, and can be vented with a short length of tubing. (Hole diameter is 5mm / 3/16") Can be used for the Aquaterra Prism as a scupper plug. This is a possible substitute for the Necky rudder stopper blocks. Can also be used as a replacement for a screw-in drain plug or as a scupper stopper in the cockpit of a sit-on-top kayak. The large end is 25/32”. The small end is 5/8".
See the *SIZE CHART and check fit to your kayak brand on the DRAIN PLUG LOOKUP TOOL
Add 18” of cord for one dollar to use as a leash if needed. 
Important: Rubber stoppers have a HOLE. The hole is for an optional 18-inch cord used for securing the cork to your kayak and/or for easy removal. The cord fits very snug and will not leak. This adds one dollar to the cost.
Corks with holes can be used as dive flag pole mounts. A 12-inch tube can be inserted for use as a breather vent for surf skis. The hole can be filled with GOOP brand sealant-adhesive if so desired. Please select your option from the menu.
