The FC1010 from Cleveland Tank is a vented brass diesel fuel cap with a male thread design, for fuel tank necks that take a male-threaded cap rather than the female style used on most of Cleveland Tank’s other caps. It has a 2.125-inch diameter and 12 threads per inch (12 TPI), non-locking, and vented so the tank can properly equalize pressure as fuel is drawn down instead of risking vacuum lock. Brass construction adds durability and rigidity over a standard aluminum cap. At 1.0 lb and 2.125 x 2.125 x 2.0 inches, the FC1010 is a direct-fit replacement for diesel fuel systems specifying a 2.125-inch, male 12 TPI vented brass cap.

The FC1005 from Cleveland Tank is a vented brass diesel fuel cap for fuel systems that rely on the cap itself — not a separate equalizer line — to let air into the tank as fuel is drawn down. It has a 4.00-inch diameter and female threads at 8 threads per inch (8 TPI), non-locking, built from brass for extra rigidity and durability over a standard aluminum cap. Fitting a non-vented cap on this type of system risks vacuum lock, so the FC1005 is specced to avoid that while still resisting leaks, cracks, and contamination. At 1.0 lb and 4.0 x 4.0 x 2.0 inches, it’s a direct-fit replacement for diesel fuel systems specifying a 4.00-inch, 8 TPI vented brass cap.