"DESIGNED TO HOLD MIL-D-3464 BAGGED DESICCANT FOR USE IN SHIPPING AND STORAGE CONTAINERS; HOLDS FORTY UNITS OF DESICCANT; COVER IS PASSIVATED STAILESS STEEL; INCLUDES SPANNER NUT, MS28775 O-RING AND GASKET; APPROPRIATE FOR USE ON NEMA 1,2,3,3R,3S,4,5,6,12,12K, AND 13 ENCLOSURES AS WELL AS I66/IP67 ONES; BAGS CAN BE REPLACED EASLY WITHOUT OPENING THE ENTIRE CONTAINER - THROUGH A 4.014 IN. HOLE"