JYINCPED 2" Vented Transfer Tank Fuel Cap with 2in Threaded Cast Iron Neck — Lockable, Corrosion-Resistant

JYINCPED's 2-inch vented transfer tank fuel cap is a lockable, corrosion-resistant replacement cap and threaded neck assembly designed to safely vent pressure and prevent leaks for diesel and fuel transfer tanks with a standard 2" NPT bung.

This vented fuel cap and heavy-duty cast iron neck from JYINCPED replaces worn or non-venting caps on transfer tanks, auxiliary tanks, mobile fuel carriers and many weather guard style tanks. It fits standard 2" female-threaded bungs found on transfer tanks for trucks, trailers and stationary distillate tanks. Built with a spring-loaded sealing gasket and a lock-ready tab, the assembly balances controlled venting with theft deterrence and long-term corrosion resistance.

How does this cap manage tank pressure when filling or drawing fuel?

The cap uses a bidirectional venting path and a spring-loaded seal to equalize pressure safely. When you loosen the cap it releases built-up vapor pressure; when fuel is extracted it allows air in to prevent vacuum collapse.

• Both-direction venting releases internal pressure before full removal.
• Spring-loaded inner gasket maintains a seal while driving to prevent leaks.
• Vent prevents dangerous vapor accumulation and tank over-expansion.

Will this fit my truck’s transfer tank or replacement bung?

Yes, it is engineered for standard 2" NPT threaded tank bungs. It replaces Dee Zee Fill-Rite style transfer tank caps and fits most transfer tanks on pickups, trailers and stationary fuel drums with a 2" female thread.

• Compatible with standard 2" NPT threaded tank bung bases.
• Works with many makes, including Ford, Chevy, GMC, Toyota, Nissan, Ram and others that use 2" threads.
• Suitable for transfer, auxiliary, mobile, and weather-guard style tanks.

How does the lock feature deter theft and tampering?

The cap includes an integrated tab with a hole sized for a 1/4"–5/16" shackle padlock (padlock not included). When secured, the lock prevents cap removal and significantly reduces siphoning, tampering and opportunistic theft.

• Lock-ready tab accepts common 1/4"–5/16" shackle padlocks.
• Tabs lock down the cap to the cast iron base to block removal.
• Simple retrofit adds security without modifying the tank.

What materials and maintenance should I expect for durability?

The cap assembly combines a heavy-duty cast iron base with a removable vented cap made from corrosion-resistant materials. Routine inspection of the gasket and lock slot keeps the system performing and leak-free for long service life.

• Cast iron threaded neck for robust mounting and load resistance.
• Waterproof, corrosion-resistant cap components to withstand field conditions.
• Removable cap and replaceable gasket make maintenance straightforward.

Who is this for: JYINCPED's 2" vented transfer tank fuel cap is ideal for fleet managers, farmers, contractors and private vehicle owners who use transfer tanks, auxiliary diesel tanks or mobile fuel systems and need reliable venting, anti-theft protection and a durable replacement for worn or non-venting caps. It’s useful for anyone seeking a direct-fit 2" NPT replacement that balances secure sealing, controlled venting and easy installation.