SpudFiles

Note that some shock pumps with moulded plastic parts can fail when pumping up larger chambers. This is because the heating of the air as you compress it, weakens the plastic to the point of failure.

Shock pumps are really only suited to pen-guns and the like... You're better off with a homemade floor pump for larger stuff.

if you can send me the desing too ill be more than happy

I can send a design if necessary. Wink

many junk yards will let you have the fridge compressor for real cheap because they scrap everything anyways. i payed 5$ for my pump

The pump design is something like this. I don't have any CAD programs so Paint will have to do. I suggest using thick(1/4''?) o-rings to optimize the seal and minimize the chance of o-ring failure. Most hardware stores sell 1/4'' NPT hoses with the fitting already attached. It may be tough, but find a thread-on Schrader coupling for 1/4''.