A plug. Double 0 or bigger, double flared plug in acrylic (preferred) Screw fit would be nice as well, but not really needed. The O Ring kinds like to fall out when sleeping...too hard to find the next morning. Red would be preferred, but whatever color is fine. My buddy and I have scoured the net looking for one (or a pair). www.anotherhole.com doesn't seem to have what he is looking for. Great site, btw. Titanium double flair plugs for $19.99 a pair (got in when they were only $15.99 awhile back) Anyone out there (in here) have a link of where I can look for one? Thanks all!