do regular caps that go on tire valve stems work if the cap that comes with it is lost? like is it the same thread pitch and size as the valve cap

Yes, regular tire valve stem caps will fit perfectly.

can i leave thecap on but loose for storage to prevent bloating and can it be used on a metal jerry can?

Yes, you can leave the cap on but loose to prevent bloating, this is exactly why I purchased this product. Yes it can be used on metal gas cans. I had previously purchased the plastic versions, to prevent bloating, but with an open HOLE, dust and small trash can enter. With this vent, nothing can get in but air when loosened. I think you'll be very satisfied.

Can these be used on the metal 5 gallon jerry cans?

Couldn't see why not. I would be concerned about metal chips getting into the tank. Might initially need center drill or starter drill prior to the provided kit drill.

Will these vent caps work with 4-gallon rotopax container which have quite thick walls?

Hello,our vent caps can be used for most plastic fuel gas can. As for the thick wall, here is the length of our vent cap is about 0.87in for your reference.

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Magicfour Fuel Gas Can Vent Caps, Fuel Gas Can Vent Kits Fuel Gas Tank Vent Caps with Lanyard-Attached Cap for Gas Can Fuel Tank Water Jug to Allow Faster Flowing (New Upgrade) (12)

Magicfour Fuel Gas Can Vent Caps, Fuel Gas Can Vent Kits Fuel Gas Tank Vent Caps with Lanyard-Attached Cap for Gas Can Fuel Tank Water Jug to Allow Faster Flowing (New Upgrade) (12)

Product ID: 404890097

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Details

Brand
Magicfour
Colour
Material
Alloy Steel
Exterior finish
Stainless
Item dimensions L x W x H
12 x 6 x 1.3

⏩Faster fuel flow with venting design

🔗Lanyard-attached cap prevents loss

🛠️Premium stainless steel & anti-corrosion rubber

Description

⛽ Upgrade your fuel game—pour faster, stay secure, and never lose a cap!

EFFORTLESS FUELING - Vent design accelerates pouring speed, saving you valuable time and hassle.
RUSTPROOF DURABILITY - Crafted from premium stainless steel and anti-corrosion rubber for long-lasting performance.
SECURE CAP ATTACHMENT - Innovative lanyard-attached cap ensures you never misplace your vent cap again.
UNIVERSAL COMPATIBILITY - Fits all 3- and 5-gallon fuel tanks and water jugs for versatile use.
COMPLETE INSTALLATION KIT - Includes drill, wrench, wire, and stickers for a seamless upgrade experience.

Magicfour Fuel Gas Can Vent Caps come in a 12-pack featuring premium stainless steel and anti-corrosion rubber construction. Designed with a lanyard-attached cap and double rubber seals, these vent caps prevent leaks and loss while enabling faster, smoother fuel or water pouring. Compatible with most 3- and 5-gallon fuel tanks, the kit includes all necessary tools for easy installation, making it the ultimate upgrade for efficient and hassle-free fueling.

Specifications

Manufacturer	Magicfour
Brand	Magicfour
Product Dimensions	12 x 6 x 1.27 cm; 259 g
Item model number	K0522B0
Exterior	Stainless Steel
Manufacturer part number	Magicfour
OEM Part Number	K0522B0
Item Weight	259 g

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