3M Filter Retainer, 501 FILTER,RETAINER,WE 1251B001 (Pack of2) Approved 3M system component Designed to hold 3M Particulate Filter 5N11 and 5P71/07194 (AAD) (sold separately) Component works with 3M Respirator 5000 Series, 3M Cartridges 6000 Series, and 3M Filter Adapter 603 Color: Translucent white Measures 4 high x 8.5 long x 4.5 wide