Co2 8 Gm Gas Bulb Holder For Pin Valve with Stainless Threads

Plastic Screw on holder for the small Co2 8Gm Bulb

 

These are the ones with the  stainless steel thread inserts and last a lot longer than the plastic ones

Screws directly onto the Pin Valve on your barrel. The threads on them don't last forever so you need a spare one!