One piece welded aluminum construction. 1-1/4″ diameter, 2-1/2″ high, with 1/8″ NPT male outlet at bottom and filing port with unvented plug at top. Suitable for normal or inverted flight. Capacity 1.4 oz, Weight 1.8 oz, can be threaded directly into master cylinder port. Two units required on most installations or one per each master cylinder.