Rachet-Pro™ Series Multi-Service 4FF Style Cover Kit works with RPSFB, RFSFB-OG, and RPNFB floor boxes. Kit comes complete with adapter ring to secure into the boxes, (1) 3/4 inch trade size screw plug and conduit fitting for power, 1-1/4 inch trade size screw plug and conduit fitting for low voltage (communications or Audio/Video) services.