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Found this on the WIT site under class rules. Rule 15.7

15.7 (Mark IISD and Mark III only). Drain tube outlet ports in transom. Maximum number permitted shall be two. Maximum diameter of each 112mm (4.3/8”). Outlet ports shall be connected with the cockpit in a watertight manner by tubes of maximum diameter 112mm (4.3/8”). Regards, Davdor