The F1H is a single door, flush mounted access cover reinforced to withstand a 25-foot column of stationary water, and H20 load rating. F1H series cover should be used in areas prone to flooding, in off street locations where the unit will not be subjected to high density traffic. Acceptable locations include vaults located close to roadways but not in the street. The F1H series is also ideal for access to potable water storage tank or vaults in areas where odor control is a determining factor.