1. Marine policies cover leakage caused by maritime perils. Leakage may also be an insured peril but this will not include loss from ordinary leakage occurring in liquids by evaporation, soaking into the container or other natural causes except to the extent that the loss of liquids (e.g. palm olives or molasses shipped in bulk) exceeds a certain amount or percentage. This is known as ullage. 2. Household. Leakage of oil from any fixed heating installation under both buildings and contents insurances is covered.