Get a two liter plastic cola bottle with a removable round plastic seal. Drill or poke a round hole(3 or 4 millimeter) through both the cap and the round inner seal. Drill the hole in the exact middle so that the holes of the cap and seal line up when you tighten the cap on the bottle. Then cut a round piece of balloon or some other fairly thin rubber. Put the piece of balloon inside the cap and then snap the inner seal back into place. Then after you put the cap back on the bottle poke a couple of tiny holes in the balloon with a needle where it appears in the hole so the gas from the fermenting wine or hooch or cider or whatever can escape. Poke the holes when the cap is fully tight and you can see that the rubber balloon piece is sitting flat and not bunched up in the hole. To hide the hole be sure to use a piece of balloon that is a color similar to that of the bottle cap. The inner plastic seal ensures that the bottle is properly sealed and it holds the balloon piece or rubber in place as the pressure pushes up on the seal. One tiny needle hole in the rubber or balloon may be sufficient but I made 3 holes just to be sure. If you remove the cap after fermentation starts, poke a couple of new holes because the rubber position may change. Also be sure the rubber remains flat and doesn’t bunch up as you turn to tighten the cap. I want to try a piece of rubber kitchen gloves( the rubber is a little thicker.) As the CO2 pressure builds the balloon piece will protrude into the hole a little. Just be sure the hole you drill into the cap and seal are only a few millimeters wide. You can cover over the hole by putting a price tag over the hole but be sure to poke a hole in it with the needle. Just be sure the price tag says somewhere between 99cents and $2.50 otherwise it will look suspicious and the warden and his buddies will be the ones guzzling your brew. Nobody sells 2 liter coke for $7.99.
Post time: Jun-14-2017