Cam-Lock Deck Covers MMC deck covers for Butterworth openings are simply dropped into deck opening, then each of three helical cams is rotated one half turn to secure the unit to the deck. An MMC deck cover can be closed or opened in seconds without need for special tools.
Installation requires no drilling or doubler rings and no deck studs, nuts or gaskets.
MMC Deck Covers are supplied in accordance with the ship's deck thickness. Other seal and cover materials are optional. The valve units can be used for cargo tank gauging, tank dryness checking and cargo sampling with closed or restricted sampling systems. No tools are required for opening or closing. Other seal and cover materials are optional.