NIOSH-Approved N95/N99 Masks for about $1 Get them now!
These 180° adapters have a 0-4 mm Chem-Cap® valve between the top outer and lower inner joints. The overall lengths of the 14/20 and 24/40 sizes is approximately 125 and 190 mm, respectively. Available in 14/20 and 24/40 joint sizes in two different styles.
The replacement plug is a CG-961-01.