Commercial Outside Faucet
On a commercial or industrial outside faucet, there are many different applications ranging from locked doors and keyed on-off valves most commonly used is called frost proof or freeze proof outside faucet and in most commercial applications these are designed for if the outside faucet freezes there is no water inside the head of the outside faucet limiting the chance of damage as the mechanical seal inside the frost-proof faucet is in the rear of the nipple normally 10 to 12 in concealed in the wall from the face of the exterior. And these will screw, solder, or solvent cement (glue) to a drop-eared L fitting securely fastened inside the wall cavity similar to residential install but different materials.