The 3M™ Secure Click™ Quantitative Fit Test Adapter FF-800-06 consists of a fit test adapter with port that is installed on a 3M™ Secure Click™ Full Facepiece Reusable Respirator FF-800 Series. The FF-800-06 fit test adapter is installed where the speaking diaphragm is normally assembled. Fit test tubing can then be inserted onto the fit test port. After performing the quantitative fit test, remove the 3M Secure Click Quantitative Fit Test Adapter FF-800-06 and reassemble the 3M Secure Click Full Facepiece Reusable Respirator FF-800 Series per the User Instructions prior to using in a contaminated environment.