Mk2A Stores Ref: 6D/4582 | Martin Baker Part No: MBEU/55748
The Mk2A PEC was only used in the RAF for the Vulcan B2.
A "Bomber Type" PEC for low altitude, it provided connections for: breathing oxygen, AVS, and communications. Similar to the Mk2, but with the addition of the anti-drown valve.
The crewmembers second and third from left have Mk2A PEC's hanging from their life jackets.
This image shows a Mk2A PEC. Clearly visible is the anti-drown valve at the base of the oxygen hose.