This diaphragm has a total stem length, from behind the diaphragm to the tip of the stem, of about 3 3/8". There is a steel plate fitted between the rubber diaphragm and the cast iron armature disc.
There is a raised circular spigot or collar on the upper face of the armature disc.

Part Code
JC043
Price
£37.50
Diaphragm fitted with long spindle for high pressure pump
Diaphragm fitted with long spindle