To use simply insert an 8g gas bulb and screw down onto the valve on the top of the barrel. It is important that you have a pin valve as this won't work with the standard S30 valves.
S30 Bulb Holder For 8g CO2 Pin Valve - For Homebrew Barrels / Beer Kegs
Plastic Bulb Holder for 8 grm CO2 bulb FREE P&P
Plastic Bulb Holder for 8 grm CO2 bulb Homebrew2u
8g Plastic Bulb Holder For Co2 & No2 Sparklets - 2+ For 5% & 3+ For 10% Discount
Plastic Bulb Holder For 8g Co2 System For Homebrew Pressure Barrels Beer Kegs
5 Gallon Pressure Barrel & 2" 8g Pin Valve Cap, Metal Bulb Holder & 2 CO2 Bulbs
