The Wilwood cap is made for Girling master cylinder nylon remote reservoirs and incorporates a vented diaphragm to maintain proper venting and pressure relief. As a direct-fit replacement cap for Girling-style remote reservoirs, it restores sealing and diaphragm vent function without altering reservoir geometry and is intended for use with compatible Wilwood or Girling master cylinder remote reservoir arrangements.
Wilwood Cap - Girling Master Cylinders Nylon Remote Reservoirs M/C w/ Vented Diaphragm