Leak protection technology sold as a component of humidifiers and air purifiers

Tin cans, collapsible tubes of metal, high pressure gas containers, steel drums, and other packaging containers of metal; metal stoppers for packaging containers, metal lids and caps for packaging containers; liquid storage tanks or reservoirs of metal; industrial water storage tanks of metal; liquefied gas storage tanks of metal; gas storage tanks of metal; internal floating lids of aluminum for use with gas or liquefied gas storage tanks; valves of metal other than parts of machines