Norton single cylinder carb manifold connector (spigot) screw in type, 1 1/4 inch diameter mounting boss. Polished stainless steel: 3-1/2 inch (89mm) overall length; 1-1/4 inch (31.7mm) diam mounting boss; 1-1/8 (28.5mm) bore; 1-3/8 inch thread for Norton singles.
