I'm planning to use CO2 Fire Extinguisher. What thread should I take ?

BS341 / DIN477 / W21.8x14 is standard used in Europe for most refillable CO2 cylinders including CO2 fire extinguishers.

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Low pressure gauge did not go to 0 even tho the regulator was removed completely from the canister...I'm wondering if this is normal at all?

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I'm curious if the bubble counter on your Pro SE series is equipped with a check valve?

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