The SR 280 / SR280-3 adapter is designed to connect Sundstrom SR-series filters to your SR200 Mask using the built-in thread (EN148-1).
All SR200 Masks in Australia are shipped complete with one of these, but if you've damaged or lost yours then this is the part you need.
Tested in accordance with EN 136:1989.
Spare Part Number: H09-0212
Model: SR 280/SR-280-3