co2 extinguisher

Hey all I recently acquired a 300L stocked tank which came with a Co2 system. The tank is close to 20 years old and had a lot of established plants which the previous owner supplied Co2 for. They told me they would give me instructions as to how and when to use the Co2 as they had it on a...

CO2 fire extinguisher, new & unused, Jactone, dated 2011, x7 available, £15 each   Age and condition: New, dated 2011 + various months, some of them have the frost horn accessory damaged (the black attachment in pictures), they arrived this way to me, rest of the extinguisher is in new condition...