For single common-main bilge systems, the control valves required in the branches from the bilge main are to be accessible at all times for maintenance. This accessibility is not required for multiple common-main bilge systems arranged such that any single control valve failure will not disable the bilge pumping capability from any one space. In all cases, control valves are to be of the stop-check type with remote operators. Remote operators may be controlled from a manned machinery space, or from an accessible position above the freeboard deck, or from under deck walkways. Remote operators may be of hydraulic, pneumatic, electric or reach rod type.