This is a zinc-plated brass Humidty Indicator Plug with a glass window. Furnished with gasket, gasket retainer and nut. It may be installed in container through a 0.515 in. (13.1 mm) diameter hole.
For optional single or multiple spot discs please contact us.
We also supply a service kit as we recommend the humidity indicator paper be replaced every 3-5 years.
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