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: 468239431

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Details

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

⏩Accelerates fuel flow for quick pouring

🔗Lanyard-attached cap prevents loss

🛠️Premium stainless steel & rubber build

Description

⛽️ Upgrade your fuel game with faster flow and zero cap loss!

BUILT TO LAST - Crafted from durable stainless steel and premium rubber for long-lasting performance.
UNIVERSAL FIT - Compatible with all 3- and 5-gallon fuel tanks and plastic water jugs for versatile use.
NO MORE LOST CAPS - Innovative lanyard-attached design keeps your vent cap securely tethered at all times.
SPEED UP YOUR POUR - Engineered venting system ensures faster, smoother fuel or water flow—saving you time and effort.
LEAK PROOF CONFIDENCE - Double rubber sealing rings provide a secure, leak-resistant seal you can trust.

The Magicfour Fuel Gas Can Vent Caps (12-pack) feature premium stainless steel and rubber construction, a lanyard-attached cap to prevent loss, and a venting design that accelerates fuel or water pouring. Compatible with 3- and 5-gallon fuel tanks and water jugs, these vent caps offer leak-proof reliability and easy installation, making them an essential upgrade for efficient fuel handling.

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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