|The racing fuel bladder is made of ballistic nylon and urethane composite. The outer shell is comprised of a kevlar and fiberglass sandwich with vinyl esther resin. Lower fittings in 9/16 AN are supply and return. Catch tank or "swirl pot" is fitted at bottom of tank for consistency of fuel supply while at speed. Venting has rollover protection valve with check ball. Neck dimension is 4 inches (101.6mm) diameter. Bladder Holds 85 liters (21 gallons) of fuel with foam inserts. Tank is supplied with neck and cap separate from top plate for custom fitting to decklid. The result is a high-tech replica of the legendary 110 liter tank used in competition in the 1960's and 1970's.