The Auto Hydrostatic Inflatable Personal Flotation Device (PFD) will only automatically inflate when submerged in 4 or more inches of water and not prematurely due to rain, spray or humidity. No inflator maintenance is require for 5 years unless the PFD has been inflated. You can easily view the inflator status and replacement date through the safety inspection window. Green indicates ready for use. The Auto Hydrostatic Inflatable PFD is USCG approved for commercial use on Undisputed Commercial Vessels (UCV) less than 40 feet long, when worn in lieu of Type II and III Pads under 46 CFR 160. 064 and are approved under 160. 076.