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Valve Options: Normally Closed and Normally Open options are available for various sizes
Two-Way Control: Gives moisture back to a container that has dried and takes it in when the air is wet
If the probe is contaminated (dirty)
Kootenay Filter Pre-Filter 500SL | Air Filter Replacement Light Meters + PAR Meters We don't use paclobutrazolExtend Filter Life with the Kootenay 500SL Air Filter Replacement Designed for SL500 filters without a flange, the Kootenay Filter Pre Filter 500SL blocks dust, debris, and larger particulates from reaching and clogging your primary filter. This replacement pre filter enhances air filtration efficiency, supports odor control, and reduces system maintenance over time. With a 16'' diameter, 20'' length, and compatibility with 6'', 8'', and 10'' flanges,