Is each cartridge a one time use for a 64oz growler?

One cartridge should last for at least two 64oz growlers

Can the co2 cartridges go in the refrigerator once attached to the mini keg?

Yes, colder better for carbonation.

is there any nitrogen in this? what is the purity %

It is 99.5% pure CO2. There should not be nitrogen in it.

What's the threading on thees. Is it a standard threading ir proprietary?

This is a standard thread, 3/8x24, it is not proprietary.

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Description

⚡ Elevate your carbonation & ride game with TrailKeg’s all-in-one CO2 power pack!

LIGHTWEIGHT LIFESAVER - At just 16 grams, these cartridges are the perfect compact companion for cyclists and homebrewers alike.
SEAMLESS COMPATIBILITY - Standard 3/8-24 threading fits TrailKeg growlers and most bike inflators for zero hassle.
ONE CARTRIDGE TWO POWERS - Effortlessly switch from pressurizing your growler to inflating your bike tire—ultimate versatility on the go.
QUICK CONNECT CONVENIENCE - Designed for fast, tool-free installation so you spend less time prepping and more time enjoying.
PURE PRISTINE CARBONATION - Food-grade CO2 guarantees the cleanest, freshest taste for cocktails, kombucha, and craft seltzers.

TrailKeg’s 16g Threaded CO2 Cartridges deliver 100% food-grade, non-lubricated CO2 in a universally compatible 3/8-24 threaded canister. Perfect for carbonating beverages like kombucha and seltzers or inflating bike tires, these lightweight cartridges offer quick installation and reliable performance for homebrewers and cyclists seeking premium versatility.

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