RN CDBA (MK16) Scrubber Top Assembly

Added 22/6/26: The Royal Navy's version of the MK16 was the CDBA which used a full face-mask made by Avon Defence.  A set of videos was commissioned by MOD in the 1990's  called 'Strength in Depth' that described this and other UBA's at the time.  It was commissioned for the Royal Navy by Visua (part of the Services Sound and Vision Corporation, or SSVC). They included superb animations by the well known UK animator Rob Lord of Pearce studios.  I have screenshotted a part of the video showing the movement of gas molecules through the scrubber stack.  The animation clearly shows the white plastic mesh underneath the topmost circular foam pad immediately underneath the clear Lexan scrubber cover (see screenshot taken from the animation below).