An opening usually equipped with removable cover and large enough to admit a man into a cargo tank or dry bulk trailer; may incorporate vents, fill opening and other devices
A safety hole constructed in the side of a gangway, tunnel, or slope in which miner can be safe from passing locomotives and car Also called a refuge hole
Large opening in the side wall of a wine tank through which spent pomace or lees is removed after the wine is racked (drained) off Cellar workers can enter through the manhole for tank cleaning
A manhole is a large hole in a road or path, covered by a metal plate that can be removed. Workers climb down through manholes when they want to examine or clean the drains. a hole in the surface of a road covered by a lid. It is used to examine underground pipes, wires etc