The operation of certain appliances and machinery includes the flow of water through the appliance or storage of fluid within the appliance, leading to the risk of significant fluid leakage. An overflow pan may be provided beneath the appliance to contain any fluid leakage. The overflow pan may include a movable portion which is configured to permit passage of a horizontally-extending portion of the appliance, such as a drawer. This movable member may be biased to return to a closed position when the horizontally-extending portion of the appliance is retracted, so as to form a fluid-retaining seal with the remainder of the overflow pan.