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CO2-safe check valve

In the Pet Warehouse catalog they have the Dupla check valve (page 68,
$14.50) and a brass check valve (page 23, $1.90).  Does any one know if the
brass valve is all brass or does it just have a brass casing?  And if it is
Co2 safe?

I know the it's only a difference of 12 buck but with the initial cost for
setting up a planted tank (my first) every dollar counts.