Does anybody know which psi/flow rate is let through when the regulator is full-open? i can't find it anywhere

These aren’t very precisely made I don’t think there is any flow rate that you’re going to establish for every unit. It is going to vary.

can the barb be removed and if so what is the thread underneath?

The Barb is Press-fit in tightly - You may be able to heat it up and pull it out and Tap the Bore with a small Tap but that may damage the device for trying if your not careful and use the correct size Tap for the Bore Hole which I cant tell you what that might be so..... "your on your own kid for trying" ---- Better order two to be safe.....

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Breathe Easy, Regulate Smart! 🌬️

USER FRIENDLY - No gauges, just straightforward operation for hassle-free use.
DURABLE DESIGN - Crafted from solid brass for long-lasting performance.
COMPACT LIGHTWEIGHT - Perfect for portability without sacrificing functionality.
PRECISION FLOW CONTROL - Easily adjust oxygen flow with a simple knob.
UNIVERSAL COMPATIBILITY - Designed to fit all disposable oxygen tanks seamlessly.

The Joywayus Solid Brass Oxygen Regulator Tank Valve is a compact and efficient solution for controlling oxygen flow from disposable tanks. Featuring a 1/4" barb output and a durable solid brass construction, this user-friendly regulator is designed for seamless compatibility and ease of use, making it an essential tool for both professionals and everyday users.

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