Gas Mask ONLY, without filters. Size 4 only
NSN: 4240-99-147-9263 (eg. for size Medium)
This is the current British Army issue GSR (General Services Respirator) made by Scott Health and Safety.
Size 1 XL (head size 60-61cm)
Size 2 Large (head size 58-59cm)
Size 3 Medium (head size 56-57cm)
Size 4 Small (head size 54-55cm)