Keg Conversion Kit

A keg conversion kit is a box of draft parts that turns an ordinary refrigerator into a kegerator. Open it and you find a CO2 regulator, a keg coupler, a shank, a faucet and tap handle, and the beer and gas lines that connect them, everything needed to mount a tap on a fridge you already own. Kits come in two mounting styles: door kits drill a faucet through the fridge door, and tower kits sit on top for mini fridges and chest freezers. The fridge supplies the cold; the kit supplies everything between the keg and the glass.

The appeal is arithmetic. Ready-made kegerators start around $400 to $500, while a conversion kit runs $100 to $300 and does the same job on a spare fridge, a garage find, or a $150 compact unit. That is the difference between draft beer being a plan and draft beer being a weekend project. The kit also turns a plain refrigerator into a proper home tap station instead of a box that happens to hold bottles, which changes how a room gets used.

A conversion kit is not a complete kegerator. It ships without the refrigerator, without the CO2 tank, and without the keg, and most kits also expect you to supply the hole saw. It is also not a tap tower by itself, and it is not a jockey box, which chills beer in ice without any refrigeration at all. The kit is the plumbing of a draft system, not the whole system.

What the fridge has to fit before you drill

The whole project lives or dies on three interior measurements: height, width, and depth with the door closed. A full-size half-barrel keg is 23 3/8 inches tall and 16 1/8 inches in diameter, so a fridge needs about 28 inches of interior height and 17 by 17 inches of floor to hold it with the coupler on top. A pony keg is the squat 7.75 gallon size at about 14 inches tall, while a sixth barrel and a corny keg stand 23 inches tall but only about 9 inches across. Sixth-barrel kegs, the sixtels of the trade, hold 5.16 gallons and stand 23 3/8 inches tall with a 9 1/4 inch diameter, which makes them the most conversion-friendly size, while homebrewers' corny kegs are 5 gallons at 8.5 inches across and slide into almost anything. Measure from the top of the compressor hump, because that step eats real height.

Mounting style follows the fridge. Door-mount kits put the faucet through the fridge door at the height you choose, which keeps the taps at glass level but leaves a shank protruding into the interior; tower kits run the lines through the top, which suits a mini fridge but needs a hole drilled in the cabinet roof, well clear of coolant lines. The three styles, door, tower, and the keezer kit for chest freezers, are chosen entirely by the appliance you already own.

The coupler is the part people forget. A standard Sankey coupler stands about 3 3/4 inches tall and adds 5 to 6 inches to the keg's height, while a low-profile coupler drops that to 2 1/8 inches and can be the difference between fitting and not. A 5 pound CO2 tank measures about 8 inches across and up to 20 inches tall, so decide whether it lives inside the fridge or on an external mount before you start. Set the regulator to 10 to 12 psi, drill a 7/8 inch hole for the shank, and sanitize the lines before the first pour.

Conversion kit versus a ready-made kegerator

A conversion kit and a finished kegerator solve the same problem at different points in your life. The kit assumes you own a fridge; the ready-made unit is the fridge. When you already have a spare refrigerator, the kit is the cheaper path and the drilling is the only real skill required. When you have no fridge and no desire to drill one, a purpose-built kegerator arrives ready to pour.

The quality trade cuts the other way. Entry-level kits ship chrome-plated faucets and basic regulators, and pitted chrome is why stainless contact parts cost more later. Buying a kit with a stainless faucet and a dual-gauge regulator up front avoids that. And the one cost the kit cannot dodge is the CO2 tank, which almost never ships in the box. Warranty is part of the trade too: drilling into a fridge voids its warranty, so a kit build belongs on a fridge you are willing to sacrifice.

Where the conversion kit came from

Home brewing became legal in the United States in 1978, after half a century of prohibition-era restrictions, and the homebrew revival of the 1980s created the market. Homebrewers already had surplus corny kegs from the soft drink industry, so the missing pieces were regulators, couplers, and faucets, the exact contents of a modern kit. Homebrew supply stores and draft-equipment distributors such as KegWorks, Kegco, and Micromatic packaged those parts into kits, and the DIY kegerator guide became a staple of the community. DIY guides from outlets like Family Handyman and WIRED put the $100 to $300 price tag on the project in the 2010s and turned the kit into a weekend build. The keg conversion kit is the physical form of that scene's trickle-down: commercial draft plumbing, repackaged for a garage fridge. The same pro-grade tap plumbing methods apply once the parts are in hand.

Common mistakes

Measure first, drill second. The most common failure is buying a kit and then discovering the fridge interior is an inch too short for the coupler, or that a top freezer compartment blocks the keg entirely. Choose a freezerless fridge with a bare 4.4 to 5.0 cubic feet of interior and remove the door shelves before you commit. Models with the cooling plate built into the back wall give the most usable height, and a top-mounted freezer compartment is a deal breaker for a tall keg.

Do not drill the wrong surface. Mini-fridge tops hide coolant lines, and one hole saw through them kills the fridge. Door mounts avoid the lines, and tower mounts on a mini fridge need a careful look at the cabinet before the drill bit starts.

Do not assume the kit is complete. The CO2 tank, the keg, and the drip tray are separate purchases in most kits, and a full half barrel adds about 160 pounds of weight the fridge floor has to carry. Budget the tank and reinforce the bottom shelf. Finally, set the pressure low and work up: 10 to 12 psi pours clean, while cranking the regulator to force a slow tap is how a glass of foam happens.