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Compactly adapt 21mm (Id) aluminium pipe to 1/4bsp

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I have a 22mm out diameter, 21mm inside diameter pipe made of aluminium. I have a 6mm plastic tube and a 6mm push fit to 1/4inch bsp (male). How can I get the pipe end to adapt to this fitting really really compactly, the only ways I have thought if are too big ( all of this has to go inside a 25mm (Ins dia) pipe and needs to be really small.
Thanks (for air)
 
Last edited by a moderator:
tig welded is the only compact way to get it inside of a 25mm sleeve
 
Get someone to weld an end on the pipe. Then tap it out 1/4bsp. Your fitting will then screw in.
 
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