After buying commercially available "freeze proof" faucets over and over again, only to have them repeatedly break, I cam up with this thing. It has been in use sine 1998 and has never frozen. I think it has been down to 20 below zero (F) and worked fine there.

The idea is to put a regular in-line valve inside the house and "remote control" it via a drive shaft made out of 1/2 inch copper tubing. A piece of 3/4 inch tubing with a 1/2 reducer bushing soldered inside the end that is outside the house is used as a driveshaft housing. The bushing is soldered inside the 3/4 inch tube at the end. The 1/2 inch "driveshaft" pipe passes through the bushing, but is not soldered to it.

The driveshaft has a "T" on each end. The outside T is made into a T handle. The inside T is made into a coupler to connect to a standard in-line water shutoff valve.

An important trick to making this work nicely is to cut the "driveshaft" a few inches from the inside T-connection, remoce an inch of it, and then hook it back together again with a length of rubber hose and hose clamps. This acts as a universal joint, giving the shaft some flexibi,ity so that eveything does not have to be perfectly aligned to prevent binding.

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This is what the inside part looks like... A standard in-line shutoff valve turns the water on and off. The water is connected to a gutted-out outdoor faucet via a length of rubber hose. The rubber house doesn't conduct the heat outside, which keeps the inside valve warm so that it doesn't freeze. Note the rubber hose connecting the "driveshaft" halves together, giving it some flexibility so that it does not bind
Make sure that the hose runs downhill so that water drains from it when the valve is shut off.

Here the "driveshaft" and the water line leave the basement and go outside.

Outside the house, the "driveshaft" has a T-handle attached to it, made from a 1/2 inch T, a couple of 1/2 inch end-caps, and two short lengths of copper tubing. The water comes out of what appears to be a standard frost-free faucet, but in reality the faucet was an old broken one that the innards were removed from and is just used as a hose connection now. The shutoff know doesn't do anything at all any more.

The key to this is the coupler that couples the driveshaft to the indoor in-line valve. It is made of two piece of 1/8 inch rod... a U-shaped piece that goes behind the valve knob, and another piece with slightly bent ends that goes through a 1/2 inch T. The two pieces of 1/8 inch rod are attached to each other with a couple of hose clamps.