Homebrew Beer & Beverage Kegs

Which connectors fit the different keg types?

Ball-lock Cornelius kegs, including the 19 L ball-lock keg and almost all other homebrew targeted kegs (mini keg tapping heads, oxebar keg tapping heads), use separate ball-lock gas and liquid disconnects. Commercial kegs use a coupler matched to their spear type: the 20 L commercial stainless keg has a D-type spear and needs a D-type coupler. A-type and S-type spears need their corresponding couplers. Match the fittings rather than the keg's capacity; gas and liquid connections have different roles.