Connector assembly for medical gas service outlet

A connector unit for gases used to connect a wall outlet of a gas system to a front unit having a primary valve tube comprising:

• a cylindrical body adapted to be detachably connected to the wall outlet, and defining an axial passage extending therethrough;
• a secondary valve secured to the cylindrical body, the secondary valve being biased to close the axial passage when the cylindrical body is connected to the wall outlet, and being always open when the front unit is mounted to the wall and the primary valve tube is inserted into the passage of the body;
• a seal contained within the cylindrical body for sealing an exterior of the primary valve tube of the front unit when the front unit is mounted to the wall;
• a plate having an aperture adapted to be secured to a front end of the cylindrical body for attachment of the assembly to the wall while permitting the primary valve tube of the front unit cylindrically to be inserted through the aperture into the passage of the body;
• and indexing means provided with the plate, adapted for co-operation with corresponding indexing means of the front unit to ensure that a front unit specified only for use with a gas of the type supplied from the wall outlet is enabled to be connected to the connector unit.