Keg Coupler Types for Popular Beer Brands - Kegerator.com Feb 05, 2015 · Without the coupler, you would have a difficult time getting the beer out of the keg. The coupler attaches to the valve and the CO2 line, allowing the compressed air into the keg. ... No Label Brewing Pale Horse Ale: D: New England Brewing Ghost Pigeon: D: Nor’Wester: D: New England Brewing Imperial Stout Trooper: D: