How they work?
There is an adjustment cap and a lock ring to hold the cap
in place. Each ½ turn of the adjustment cap decreases that
setting by 3psi. Once you have set the pressure that you would
like to deflate to, you can tighten the lock ring to keep them
at that pressure for future use. You can also set the deflators
by using a tire that is already aired down to a desired
pressure. Simply screw the deflator onto that tire and turn the
adjustment cap in until air just barely escapes. You are now at
the desired pressure and can tighten the lock ring to keep them
set there. You will have to do this for all 4 deflators. Since
each ½ turn of the adjustment cap is 3psi of air you can use
this to adjust to different pressures for different trails. I
set mine at 12psi and left them there.
Taken from
Rockcrawler.com article.
http://www.rockcrawler.com/techreports/staun_tyre_deflators/index.asp
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