Sealey towing mirror extension sealey tb63 convex towing mirror offers a wider field of vision while towing caravans or trailers universal fit will clip onto most wing mirrors easy to adjust both horizontally and vertically ideal for use when towing caravans and trailers it is a legal requirement to fit an extension mirror when a caravan or trailer obstructs the towing vehicle s vision full eu approval sealey tb63 towing mirror extension