Transfer Tank Vented Fuel Cap w/Threaded Neck,Diesel Tank

The JYINCPED Transfer Tank Vented Fuel Cap is a lockable, spring-loaded diesel transfer cap with a 2-inch threaded neck that controls venting, prevents leaks, and fits standard 2" NPT bungs.

Designed for transfer tanks, auxiliary fuel tanks, and mobile fuel systems, this vented fuel cap replaces common Fill-Rite-style caps and pairs with a heavy-duty cast iron 2" base. It combines a pressure-relief vent, an internal gasket for a tight seal, and a padlockable tab to reduce theft and tampering. Built for outdoor and commercial use, the assembly resists corrosion and is straightforward to operate.

How does this cap manage pressure and fumes?

The cap vents pressure both when opening and while installed to keep tank pressure balanced and reduce vapor buildup. When you loosen the cap the vent lets trapped pressure escape safely; when installed it allows controlled airflow to prevent vacuum formation during fuel withdrawal.

• Bi-directional venting releases internal tank pressure when opened.
• Vent allows air in during fuel draw to prevent tank collapse.
• Reduces dangerous vapor accumulation inside the tank.
• Spring-loaded design ensures consistent vent operation.

Will this fit my existing transfer tank setup?

This cap assembly is made to replace Dee Zee/Fill-Rite style vented caps and fits standard 2" NPT threaded tank bungs. The product includes a heavy-duty cast iron 2" base and a removable vented cap, so installation is compatible with most commercial and aftermarket transfer tanks.

• Standard 2" NPT threaded neck for wide fitment compatibility.
• Works with transfer, diesel, gas, auxiliary, and mobile fuel tanks.
• Includes a heavy-duty cast iron base for secure mounting.
• Simple align-push-twist installation and removal procedure.

How secure and leak-resistant is the fuel cap?

The cap features an internal gasket and spring-loading to create a tight seal that helps prevent leaks and excess vapor release while driving. For theft and tampering protection, it has a lock tab sized for 1/4"–5/16" shackle padlocks (padlock not included).

• Inside gasket seals tightly to reduce fuel and vapor leakage.
• Spring-loaded mechanism keeps consistent contact with the neck.
• Padlock-ready tab secures the cap against siphoning and vandalism.
• Corrosion-resistant materials extend outdoor service life.

How easy is it to use and maintain?

Operation is intuitive: align the cap notch, push down, and twist clockwise to lock; twist counterclockwise slowly to vent before full removal. Routine maintenance is minimal—inspect the gasket periodically and keep the vent clear of debris to ensure reliable performance.

• Quick align-push-twist installation process for fast service.
• Slow counterclockwise turn vents pressure before removal.
• Removable cap for cleaning or replacement if needed.
• Durable materials resist rust and weather exposure for low upkeep.

Who is this for: Operators of pickup-mounted transfer tanks, contractors, farmers, fleet managers, and anyone who needs a reliable, lockable vented cap for diesel or distillate tanks. If you run mobile fuel systems, auxiliary tanks, or aftermarket transfer bungs and want improved vent control, leak prevention, and basic theft deterrence, this JYINCPED assembly is built for commercial and heavy-duty field use.