Any one used these before

 are these the type with the pull out tap ? can they hold pressure ?

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Same as the mini kegs that the commercial brews are sold in.  They can take a little pressure, but you'll need to keep it light. 
Beer is like porn - you can buy it easily enough, but its so much more fun to make it [wink]
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The Furnace Green brewer
I this one is bit old but I have used the 5 litre mini kegs for about 6 years with a strange looking 'hand pump' which gives good results
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