Hi, I am new to the forum and extremely new to wine making, so please be gentle with me. I have made my first batch using a white wine kit from Wilko. My question is (this maybe a ridiculous question). The Airlock which goes into the bung on the top of the Demi john, does the red cap need to in place or not. ? Please feel free to have a laugh at my expense at this question if needed. Thanks guys.