Could you measure your...

[mavrick1903]

Brake master cylinder? I'm looking to make a pressure bleed adapter for air hose to be able to pressurize the master and bleed the system. Need the OD of the master cylinder (which is at home right now) to make up the parts list.

 

[mavrick1903]

A 1.5" rubber pipe coupler fits over the cap just right, for anyone that's interested.