This is a zinc-plated brass Humidity Indicator Plug with a glass window. Furnished with gasket, gasket retainer and nut. It installs into a container through a 0.515 in. (13.1 mm) diameter hole. Furnished with a 20-30-40% pie sector humidity disc. Humidity disc is not field replaceable. NSN # 6685-00-464-4660.
Weight: 0.08 lbs. (36 grams)
Recommended Installation Torque: 25 - 35 in. - lbs. (3.0 - 4.0 N·m)
Maximum wall thickness: 0.15 in. (4 mm)