Ok - as the title says; i have an old 12 oz co2 bottle fs, it's got a "lik" on/off valve, and an anti siphon tube in it; it's a co2 bottle so the retest date is ... 10/15 years i think, so it's probably got a while left on test! i'll send it unfilled for ... £17 (or £17.68 via paypal) offer up - pics if necessary - it's just a bulk standard black 12 oz co2 bottle! can add the standard pin valve for a further £2