i built one with 70 dollars wirth of supplies and a free fridge being thrown out.
u take a regular tap and unscrew the air pump section that the plunger compresses air into.
inside there'll be 1 or 2 holes where the compressed air goes into. you want to make a sealed off an adapter piece attach to there. the piece you want will have the "top" exposed tip something along the lines of what a tire air pump can attach to. the end going into the tap and being sealed off you want to be just smalled than the diamter of the hole/gap it's going into. add o rings to make a semi seal before u add the cast weld. this adapter piece can likely be found in the plumbing section at home depot or lowes.
if you're lucky you can find something thatll screw into it like the air plunger section did, but dont count on it. you want to buy some pipe repairing cast weld stuff. basically the same stuff used to make casts for broken bones, but industrial strength. you basically add water and wrap this stick cloth around it to make a good seal and it'll harden into a permanent seal. make sure to follow the directions
find an air pump that'll run off 120v AC. i used a 12v one for my car and ran it off my computers power supply by spliceing and running the wires into the keg room. AND IT WORKS. but a regualr 120v one will be easier. attach that pump's end to adapter castwelded onto the tap. the regular 20 dollar air pump will be able to hold the pressurein that plug very easily, but make sure not not over pump the keg, it'll kill the pump.
make sure this part is attached before attaching the tap to the keg. drill a lil hole for the nozzle outside the fridge. also wire in a remote knob for the air pumps power and also moun that somewhere outside the fridge. dont buy a switch thatll stay in the on position, get something that clicks back to off when not pressed.
the frige i got had a working freezer but the fridge was broken. i drilled holes between the freezer and fridge. keeps the keg sooooo cold too //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
500 dollars? build your own for 150. mine's ugly as sin, but works QUITE efficently and amazingly.
the tap after cast welded.
air pump being ran off the comps 12v power wires //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
my first switch was the wrong kind and even with a warning lable drunk fockers still blew the pump. get a good switch
