Grove remote reservoirs are quality machined from 6061 billet. Top is held in place with a snap ring with O-ring seal. Supplied with vented 1/8" NPT cap plug. Anodized for corrosion resistance. Attaches to firewall or other remote location. Adequate capacity to serve both master cylinders. 1/8" Female NPT thread at bottom of reservoir and holds 2.42 fluid ounces. Unit weight is 3.6 ounces.