Hi all, this is my first post and attempt to make a water-gun...
it uses a leather o-ring at the back end of the pump to generate pressure,
the rest is mostly off insanitys_engineer's design. i decided to use copper pipe
for the pump, because i had the extra pipe but, finding an o-ring to fit on a
15mm and seal in a 22mm pipe was hard to find but i got one. the problem with
mine is that it only fits on the end. so far im down to 1 containment tank, but i
dont know how to place it, maybe i could use balloons like a CPS. i dont know much
about watergun building, this is my first try

it will use a 5l backpack bottle like insanitys_engineer (i dont want to look like im copying im sorry)
i want 2 cp tanks, if possible use balloons incased with a bottle just incase the balloons pop! but i dont mind bottles.
i have limited access to tools and i cant buy things off internet, stuck to depot stores next to my house.
ive found that in testing that i may need a 3rd check valve to stop water reaching the pump but im not sure yet and i dont think it will help.
unlike many people say you dont acctually need any couplers, i only used 1 at the end of the pump shaft. it is heavy but its manageable.
i dont know how im going to connect the hose pipe to the bottle and the check valve, need guidence on that. all in all ive got this far in 4 days!
here is a few screens of it so far:
those are the progress pics
this is what i want in the end
(please note that you may have to change the size of the image to see it damn mediafire...)
comments and help is much
appreciated!