The Tap-A-Draft system is a unique system that allows one to transport, store and dispense from a 6 liter bottle. Additionally the tap fits 3 liter soda bottles as well. The bottle utilizes a 38mm screw neck top. I found that the polyseal caps work much better and are a higher quality. Coors Light and Miller Lite are sold in these bottles as well, allowing one to get a complete unit for ~$21.00 and a gallon and a half of megaswill. The CL/ML system is designed to be a single use, but if one uses a little force, the CO2 container can be unscrewed, breaking 2 little clips allowing it to be reused more easily. Now I found out that if one simply uses an off the shelf CO2 cartridge, it will not seal properly due to a smaller neck on the CO2 bottle, and you will loose a large portion of the 16 gram CO2 cartridge, if one now pulls the little black rubber seal and flips it over and re-installs it, the other side is smaller and will work with off the shelf 16 gram CO2 cartridges.
OK, now we know how to reuse the system as is.
I wanted to put it on my 20 lb CO2 bottle and put it on-tap in my keezer, as it will fit on the compressor hump.
I wanted to be able to serve on tap.
I wanted to have quick disconnects to be able to easily swap bottles. Additionally I already have an investment in the TAD system and (15+) bottles and would like to continue to be able to utilize them. This will allow for trying different dry hopping combinations, cizer, scotch and water, etc., on tap in smaller batches.
I spoke with the manufacturer of the system and found the bottles are rated to 130 psi. I found a pressure relief valve on the bottom of the valve assembly, a little bit of hot glue seals this shut. Put the hot glue on the outside of the valve, actuated the valve several times from the inside with a small tool while the glue was still hot, trying to get some glue into the valve, then let cool. Now some modifications involved utilizing the CO2 cartridge and adding some way either a ball lock connector or a tire valve or a airline connector. They either remove the existing regulator and come straight in to the check valve or come in thru the regulator. I tried both and found the former to be unsightly. I utilized self closing connectors from Kent Systems I chose the Catagory 3 connectors. Now I took a 1/4 inch NPT threaded male connector, I removed the CO2 gasket, threaded the plastic with a brass connector of the same thread, screwed in the self closing male connector into the base of the tap, ran the line thru the previously CO2 cartridge holder, attaching the self closing female connector to the hose allowing for the entire QD system to be hidden and giving the system a handle. So now I have the overpressure system eliminated, and the bottle plumbed in to my CO2. Next, product delivery, I could now simply put the bottle on a table and it would dispense. But I want it in my keezer and dispense from a tap. I put a free flow female connector on the mouth of the dispensing valve and a self closing male on a line going to a party tap, (a real tap later). By having a free flow female connector, one can use the system as is or in tap dispensing mode. Additionally this can be made portable easily as well allowing for 6 liters of your favorite beverage on tap. The pickup tube in the bottle has a weight allowing it to touch the bottom of the vessel and completely drain it.
Now I can use my TAD bottles on tap or tote & go. I made a filler from a stopper and a bottling wand. Other ideas were to brew and ferment a batch of beer and dry hop each bottle different varying either amounts or types of hops or both. Brew a batch and fill & save one bottle for "long term evaluation". Possibly when I get to that level to have mead on tap, I currently have two functional prototypes, one of each design.
I finally went with a ball lock connector for conformity.