JYINCPED Transfer Tank Fuel Cap — 2" Threaded Neck Vented Lockable Cast-Iron Base

JYINCPED's vented transfer tank fuel cap is a lockable, spring-loaded replacement cap with a 2" threaded neck designed to vent pressure and prevent leaks for diesel and transfer tanks.

This heavy-duty replacement cap fits standard 2" NPT threaded tank bungs and serves as a durable upgrade for transfer, auxiliary, mobile, farm, and commercial fuel tanks. Built with a cast iron base and a removable vented cap, it provides controlled venting in both directions to relieve pressure or admit air, a sealed gasket to reduce spills and vapor loss, and a padlock-ready tab to deter theft and tampering.

How does this cap control pressure and prevent vapor buildup?

The cap features a venting mechanism that releases internal tank pressure when loosening, and allows air in to avoid vacuum during fuel withdrawal. A spring-loaded valve and internal gasket work together to maintain safe pressure balance without manual intervention.

• Two-way venting releases excess pressure during removal.
• Admits air to prevent tank collapse when drawing fuel.
• Spring-loaded valve stabilizes internal pressure automatically.
• Internal gasket reduces vapor leakage while venting functions operate.

Will this fit my existing transfer tank or Fill-Rite neck?

This replacement is made to match standard 2" NPT threaded tank bungs and is compatible with many transfer tank setups, including Dee Zee and Fill-Rite style necks. Confirm your tank uses a 2" threaded bung to ensure proper fit.

• Designed for 2" NPT threaded necks common on transfer tanks.
• Includes a heavy-duty cast iron 2" base for secure mounting.
• Works with fuel, diesel, auxiliary, and mobile tank applications.
• Easy alignment notch for straightforward installation and removal.

How does the lock feature secure my fuel supply?

The cap accepts a 1/4"–5/16" shackle padlock (not included) through a reinforced tab, preventing unauthorized removal and reducing risk of theft, tampering, or sabotage. The lock tab is positioned so a padlock holds the cap in place against the base tabs.

• Padlock-ready hole fits common 1/4"–5/16" shackles.
• Reinforced tab on the base holds lock securely.
• Simple locking method without special tools required.
• Deters siphoning and vandalism in field or fleet environments.

How durable and leak-resistant is this transfer tank cap?

Constructed from corrosion-resistant materials with a robust cast iron base and an internal sealing gasket, the cap is engineered for long-term use in harsh outdoor and commercial settings. The spring-loaded closure helps maintain a tight seal during transport and operation.

• Waterproof, corrosion-resistant construction for longevity.
• Internal gasket prevents fuel seepage and excess vapor loss.
• Spring-loaded closure keeps cap sealed under motion and vibration.
• Removable vented cap for maintenance or replacement if needed.

Who this is for: Professionals and owners who operate transfer, auxiliary, or mobile diesel tanks—such as farmers, fleet managers, contractors, and service technicians—will benefit from this cap's reliable venting, secure locking option, and rugged construction. If you need a straightforward, compatible replacement for a 2" threaded intake neck that reduces spills, controls vapor, and adds theft protection, this JYINCPED vented transfer tank cap is a practical choice.