All standard keg couplers produced for the U.S. market have the U.S. beer industry-standard 7/8"-14 threads on both the gas-in and beer-out ports. This universality of threads allows easy switching of keg couplers without the need to cut hoses or even remove clamps.

To change from one coupler to another, first, turn off the CO2 gas using the shutoff valve on your regulator. Then, on the coupler being removed, loosen the hex (or wing) nut fittings on both the gas and beer hose assembly and remove the hoses from the coupler. Then re-connect the hoses to the coupler you wish to use and re-tighten the hex (or wing) nut fittings. Lastly, turn on the CO2 gas using the shutoff valve on your regulator. If you have a few couplers you change between often, you may want to consider a set of quick disconnects.

The exception to this rule is the twin probe coupler, commonly used by microbreweries and craft breweries. These couplers do not have a threaded gas port. Also, couplers used for dispensing homebrew beers lack the same and a non-threaded beer port that allows for a hex (or wing) nut type fitting.