The FC1009 from Cleveland Tank is a brass diesel fuel cap for fuel systems that need the added durability of brass without a locking mechanism. It has a 2.00-inch diameter and female threads at 11.5 threads per inch (11.5 TPI), non-locking and non-vented, built to resist leaks, cracks, and fuel contamination. Brass construction gives it more heft and rigidity than a standard aluminum cap, holding up well to repeated fueling cycles and rough handling. At 1.0 lb and 2.0 x 2.0 x 2.0 inches, the FC1009 is a direct-fit replacement for diesel fuel systems specifying a 2.00-inch, 11.5 TPI female-thread 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.