The FC01015 from Cleveland Tank is a 2.125-inch diesel fuel cap built for fuel systems that don’t call for a locking closure. It has a female thread design at 8 threads per inch (8 TPI), matching the thread pitch used across Cleveland Tank’s larger locking caps, so it’s easy to spec correctly even though the diameter is smaller. Machined from lightweight, corrosion-resistant aluminum, it resists the rust and pitting that shorten the life of a steel cap. Non-locking and non-vented, the FC01015 is a straightforward, direct-fit replacement for diesel fuel tanks specifying a 2.125-inch, 8 TPI female-thread cap. It weighs 1.0 lb.

The FC01015VNT from Cleveland Tank is a vented, non-locking diesel fuel cap built 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), machined from lightweight, corrosion-resistant aluminum. Fitting a non-vented cap on this type of system risks vacuum lock, so the FC01015VNT is specced to avoid that while keeping the tank sealed against leaks and contamination. It weighs 1.0 lb at 4.0 x 4.0 x 2.0 inches and installs as a direct-fit replacement for diesel fuel tanks specifying a 4.00-inch, 8 TPI vented cap.

The FC1008 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 2.00-inch diameter and female threads at 11.5 threads per inch (11.5 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 FC1008 is specced to avoid that while still resisting leaks, cracks, and contamination. At 1.0 lb and 2.0 x 2.0 x 2.0 inches, it’s a direct-fit replacement for diesel fuel systems specifying a 2.00-inch, 11.5 TPI vented brass cap.