Abstract: A fitting for connection to a threaded drain hole of a crankcase of a compressor, the fitting including a tool engaging member having surfaces thereon for engagement and rotation by a tool, a drain plug projecting in a first direction from the tool engaging member, the drain plug being externally threaded for engagement with the threaded drain hole, a connection member for connection to a refrigeration service hose having an internally threaded connection, the connection member having an externally threaded surface for engagement with the internally threaded connection of the refrigeration service hose, the connection member projecting from the tool engaging member in a second direction substantially opposite to the first direction, a channel passing through each of the drain plug, the tool engaging member, and the connection member, and a depressible valve core disposed within the channel and within the connection member.