Makesift sanke fermenter

lol, Makeshift, not makesift.
I'm brewing tomorrow, and am simply fed up with dealing with two 5 gal fermenters for a 10 gal batch. I have a sanke key that is clean with the spear removed, but don't have access to a carboy cap, triclover conversion kit or a large enough rubber stopper. So, I'm racking my mind and searching the inter webs for ideas.

Right now I'm considering: Aluminum foil (and forgo the airlock, aka like a starter)
I'm also scavenging for any plastic cover that would seal to the flange (inside or out), but am coming up empty.

Any thoughts or advice?

 

How about using a 2-inch blow-off tube? I've cut the tops off my sankes long ago so I don't recall the exact diameter of the coupler once the tube is removed.

 

I was able to get a 5 gallon carboy cap from a buddy and managed to get it over the flange. Fingers crossed that it will stay on.

 

I use a double thick wrap of aluminum foil and heavy rubber band.

 

A large balloon, or a rubber glove stretched over the opening and a pinhole poked in it?

 

Stick that carboy cap in some boiling water to get it to stretch, then it will hold it's shape and fit over the neck of that keg easier. It'll stay on, no worries.

 

Orange carboy caps FTW.

I use them all the time. Much cheaper than the Brewer's Hardware kits (which I like, but not when you compare cost to a carboy cap!).

 

As said above, carboy cap, aluminum foil / plastic wrap w/ rubber band. Rubber glove or a balloon w/ pinholes are all fine IMO...airlocks are for long term aging, just watch out for fruit flies

I met an old time winemaker that simply used the pinky rubber balls set on top of carboys and demijohns to provide a seal that could vent.