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1.) How well do anti-siphon tubes work to help keep liquid out of your gun?
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<font size=2>They work very well. I'm was running one on my Automag and had no problems at all with liquid.
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<font size=2>2.) Does it perform well under rapid fire?
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<font size=2>Yes
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<font size=2>3.) How do you get it installed and how much does it cost?
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<font size=2>If you purchase from your local pro-shop then they will most likely install it for free. My tube cost $14.99. If you do not purchase from your shop, I suggest going to http://www.paintballgear.com and buying one from there, and having installed at your shop. If you or your shop installs it, make sure you/they re-locktite the threads on the tank valve, and air check the tank thouroughly.
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<font size=2>Hope I helped you out.</font>