Oil cap, twist fit, 1-13/16 inch opening (approx 45mm), 2" flat top with breather hole. Chromed plain surface, made in UK by Ceandess, Wolverhampton. Single knurl on edge. Perfect fit for Norton 1955 and later oil tank. Suits most makes: Ariel, Triumph, Norton AJS, Matchless, Sunbeam etc OEM numbers P2285/2; 18526; K12/291
