Anti-Siphon Tank

by Joe lambert


Why do I need a Anti-Siphon Tank?
Because your gun starts burbing, multi cycling, and chopping balls, especialy in colder weather.
Why does my gun do that? Because your gun is too cold. More than just one thing can lead to it, but, if it's cold weather and you're shooting a lot, not letting your gun warm up, and your drawing cold liquid CO2 into the gun, your cold gun will not let the CO2 expand enough to re-cock your gun, causing the above problems. Some guns like Automags sometimes freeze an O-ring and just lock up. The valve intake of your CO2 tank is usually under the liquid CO2 level in your tank, and is drawing liquid CO2 towards your gun's firing chamber. The CO2 in your tank is in the liquid state because it's under pressure. When it reaches the warmer air inside of your gun, it expands creating the needed pressure to operate it. Liquid CO2 is very cold, and the colder the gun is the less is is likly to function correctly. Many players go to HP air to get away from the Cold/CO2 problems.

Cold weather you can't do much about, shooting a lot, not letting your gun warm up can be helped by modifing your playing style somewhat, but drawing cold liquid CO2 into the gun CAN be fixed with a Anti-Siphon Tank. The idea is to draw the gas, instead of the liquid by having a tube sticking up out of the liquid like a snorkel (see illustration at right).



Get your stuff togeather You will need:
Your tank
(from your gearbag)
Your valve (out of the tank)
Some threadlock compond (hardware store...a few $)
The correct size wrench (garage)
And the anti-siphon tube (paintball dealerbetween $5 and$10)

Bend the anti-siphon tube as shown in the photos or cut it off and bend it as shown in the Illustration above (either way is ok). The idea is to make act like a snorkle in the liquid CO2.

Put some threadlock on the anti-siphon tube's lower threads (as shown in photo at left). Screw it
in to the valve by hand a little.
Clamp the valve in a vice, or get your brother or someone to hold on to it with something for you.
Using the wrench, tighten the lower bolt (the one with the threadlock on it.) Don't over tighten it.


Screw your valve into your gun's ASA adapter until it's tight like
you would if there was a tank on it.



Apply some more threadlock on the upper threads on the tube. Screw
it in hand tight. Swivel the tube so it is pointing "up", toward the gun
(see photo above).
Now use the wrench to tighten it, making sure the tube continues to
point up.


Remove the Valve from your gun. Put threadlock on your valve threads(the threads that go into your tank, NOT the GUN) Slide the valve/anti-siphon tube into the tank and ......

Screw it into the tank, hand tight.

Put it into the vice (or something) and tighted it "good and tight" (that's just a little more than "a bunch") Now when it's filled and on YOUR gun it should keep the liquid CO2 out of the gun.

NOTE: THIS WILL ONLY WORK ON THE GUN YOU USED IN STEP 5. (unless your lucky enough to have the tank stop screwing in at the same spot on another gun.)

If you have any questions go back and
read it again,
if you still have questions, email me,

Joe at Wild Lion