Quote Originally Posted by Jafar View Post
But what about the disease or chemical getting into the mucous membrane of the eye ball?
Look again.

Quote Originally Posted by Dale Gribble View Post
The 3M 6000 DIN series, 7800S series, FR-7800B, and FR-M40 series all look to support threaded filters.

http://solutions.3m.com/wps/portal/3...+8690968&rt=r3