2PCS Universal Gas Can Caps – 5 Gallon Replacement Lids with Coarse Thread for Gasoline, Diesel & Fluids – Leak-Proof HDPE Plastic Caps, Fits 1/2.5/5/10+ Gallon Cans (1.73"-1.82" Mouth Size)

What It Is

A set of two universal replacement gas can caps designed for 1/2.5/5/10+ gallon fuel containers. Use them to seal gasoline, diesel, or other fluid cans for lawn mowers, trimmers, chainsaws, and other power equipment.

Fitment & Compatibility

Before buying, measure the inside diameter of your can’s mouth. These caps fit a 1.73"–1.82" opening (roughly 44–46 mm). They use a coarse thread pattern common on many aftermarket and older gas cans—not the fine-thread or “safety” spout designs. They will not fit newer CARB/EPA-compliant cans with integrated spouts or proprietary threading. Check if your can has a standard coarse thread; if it’s a modern “no-spill” or child-resistant cap, these likely won’t work. No brand-specific fit—they’re universal, but always measure first.

Key Things to Know

• Material: HDPE plastic is leak-proof for gasoline and diesel, but avoid prolonged exposure to direct sunlight or extreme heat to prevent warping.
• Installation: No tools needed—just screw on by hand. If it feels loose or cross-threads, stop and re-align; overtightening can crack the cap.
• Common gotchas: The coarse thread is not compatible with fine-thread cans (common on newer 5-gallon jugs). Also, the cap does not include a vent or spout—it’s a solid lid for storage or transport.
• Quality check: Some users report thin plastic that can crack if dropped. Inspect for cracks before first use, and avoid using on cans with visible rust or sharp edges around the mouth.

Should You Buy It

Buy these if you have an older or generic gas can with a 1.73–1.82 inch opening and coarse threads, and you need a simple, inexpensive replacement lid. Skip them if you have a modern CARB/EPA can, need a vented cap, or want heavy-duty durability for daily commercial use.