Step 4: Plumb in the Pressure Chamber

Cut a small length of 5mm hose about 8cm long and slide it over the outlet of your Pump, slide a T-Piece on the other end.

cut a piece of pipe that will hold your pressure chamber, cut out a notch big enough to fit the nozzle of the bottle in and then at the base of that cut a length wide enough for the hose, this will allow you to push the hose up and connect the pressure chamber later.

Now hot glue this to the outlet end of the pump with the cut section facing upwards.

Opposite the pump outlet connect the T-piece to the pressure chamber and a length of hose to the remaining connector; this will go to the trigger.

Now hot glue the neck of the pressure chamber in the support pipe

Wow this is a really awesome instructable made it and took it to school for a water fight had SO much fun :)
This is a really informative inscrutable. Thanks I really wanted to make a water gun. Oh, and matoro25 why don't you make it instead of asking all those questions
How about it's stats? Do you have a test fire video or something? And most importantly, is it reliable?
oh and what does the CPS do?
to understand the CPS you have to understand the old supersoakers, they used to just pump water in to a chamber to build pressure the problem was when you release, the water pressure becomes less and less as the pressure in the chamber gets less and your water jet that started at 15ft suddenly gets shorter and shorter very quickly. some cheap copies of supersoakers still work in this way. The CPS (constant pressure system) is basically a tough balloon/bladder which the water is pumped into which is inside a hard chamber so that the pressure can build like it did before, but this time you have the balloon/bladder squeezing the water out as well. which means the pressure remains constant until the chamber is empty and your jet is constantly 15ft for the duration of the shot.
so wait, water goes into the balloon, and the pressure is around the balloon, which forces all the water out at a constant pressure because none of the air is escaping. Right?
the balloon is rubber right, what happens when you blow a balloon up and let go of it without tying it up? the balloon squeezes all the air out and it flys round the room. same thing here just with water the balloon just squeezes the water out thats all.
ohhhhhhhh I see, the balloon doesn't stop pushing water out until its empty.
very nice and informative, with a better camera this would be 10X better :) lol again verrry good job!
i was doing it with an Iphone 3G in poor lighting conditions indoors :-p
again man....this thing is awesome
Thanks, it doesnt work too bad for one made of junk, i had some issues with leaks but i just covered them in bathroom silicone

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Bio: One day I shall own a Delorean.
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