6 Pcs Gallon Gas Can Cap, 5 Gallon Replacement Lid With Coarse Thread, 3/5 Water Jug Cap, Yellow Portable Gas Tank Lid for Fuel Storage Sealing

What It Is

This set of 6 yellow gas can caps is a replacement lid kit for standard 5-gallon portable fuel jugs, water containers, or any tank with a coarse 3/5-inch thread pattern. It’s designed for sealing fuel storage, not for mower engines or decks.

Fitment & Compatibility

Before buying, measure the inner diameter of your can’s opening—these caps fit coarse-thread necks roughly 2.5–2.75 inches wide (3/5 inch refers to thread pitch, not diameter). They are not compatible with fine-thread or metric-thread cans, or with OEM caps from brands like Briggs & Stratton, Honda, or Toro (those use specific vented or locking designs). Check that your can’s neck is round and has no integrated vent valve—these caps are non-vented and may cause pressure buildup if used on sealed tanks without a separate vent.

Key Things to Know

• Material & seal: Made of hard plastic with a thin rubber gasket; the seal can dry out or crack over time, especially with ethanol-blended fuel. Replace gaskets if leaking occurs.
• Installation: No tools needed—just screw on hand-tight. Overtightening can strip the coarse threads or crack the cap.
• Common gotcha: These caps lack a vent or spout attachment. If your can needs a vent for pouring, you’ll need to drill a vent hole or buy a separate vented cap.
• Set of 6: Useful if you have multiple cans or want spares, but you’re paying for quantity over quality. Each cap is basic and may not seal as reliably as a single OEM cap.

Should You Buy It

Buy this if you need a cheap, no-frills replacement for multiple standard 5-gallon jugs with coarse threads and don’t require venting or a tight OEM seal. Skip it if you need a vented cap, a locking design, or a precise fit for a branded fuel can—invest in a single OEM cap instead for better durability and safety.