On Fri, 15 Feb 2008 14:44:20 -0800 (PST), Joe Sallustio
> wrote:

>On Feb 15, 5:01*pm, Wayne Harris > wrote:
>> OK, *I need some opinions.
>> (First a bit of background.)
>> I have some 5 gallon test batches ready for secondary fermentation.
>> I have only 6.5 gallon carboys.
>>
>> As you can see, i will have a lot of headspace with no extra wine to
>> "top off" with.
>>
>> But, *I have access to plenty of Argon gas and a regulator with a flow
>> meter so i can apply VERY slowly.
>>
>> Instead of "topping off" my carboys, can i apply a good thick blanket
>> of argon?
>> Then apply the vapor lock as per normal.
>>
>> Thoughts?
>> -Wayne
>
>Sure, you can use Argon, just use enough volumes to displace all the
>air.
>
>Joe

Can you use CO2?