Splitter kit Choose your filler:Duofiller G2/Mono G2 Fits Duofiller Core G3 and

Fits Duofiller Core G3 and Mono G3

A spare purge valve for Duofiller G3 or Mono G3

Consider using a check valve to prevent liquid backflow from the keg and into the CO2 system if the keg and the Duofiller share the same CO2 source

Spare push button

Splitter kit Choose your filler:Duofiller G2/Mono G2 Fits Duofiller Core G3 andIf you want to connect a second Mono to the same keg you need this splitter. It can not be used to split for adding a second Duofiller. There are different dimensions for Duofiller G2 vs Duofiller G3, make sure you choose the correct version. If you are buying a Duofiller, the splitter kit is already included.