Pump diaphragm for the Weber 40DCN21 series carburetors.
Please note that not all versions of the Weber DCN have a pump.
This diaphragm has a cam with, brass, spring-loaded tip.
The total height of the cam + tip is 12.5 mm, measured from the face of the disc.
The diameter of that disc is 22 mm.
Please compare this diaphragm visually and carefully with your old diaphragm as over the course of the years, various different versions were used which are not necessarily interchangeable.
Required quantity per carburettor: 1
This is item number 18 in the drawing.
Weber Part Number: 47407.249, replaces the obsolete number 47407.018 which is no longer available.