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Looking at the canister in the link photo, the canister male thread looks to be of a slight taper and formed by a set of "roll" dies. As such, if I'm right, they've done that to have the head tighten and form a continuously tighter bond and seal along the whole length of the thread rather than your more simple straight thread and rubber seal gasket method.
That type of thread is amazingly strong and resistant to leakage when coupled with the exact same type in both mating parts and is called a "pipe" thread. It's very normal for higher pressure devices such as compressed air lines etc., to have such a thread. The only drawback I can see to that device is; those types of threads require them to be mated firmly EVERY time or they are even more prone to leakage or pressure 'bursting'.
There is no apparent fail safe to make sure the top is tightly screwed on before inserting and "triggering" the gas cartridge.
Those same types of high-pressure cartridges have been used for decades in Co2 variety to power the soda siphons viewed in movies from the 40's mixing Scotch and sodas. They have also powered .177 caliber pellet rifles capable of killing a rabbit at a hundred yards with a well placed shot.
Perhaps and this is only conjecture here assuming everything I've said about the thread having a tapered aspect , but someone in a hurry, either "cross" threading or not tightening that top on thoroughly, is going to get a very nasty surprise when they insert the gas cartridge and attempt to use the device by 'pulling the trigger'.
some of the comments here are unbelievably disrespectful.
It's like this forum thinks death by dispenser happens everyday and that anytime you use a dispenser such as this you are risking death and should have known better.
This is a sad, freak accident that no one could have ever predicted.
One reason for using a N2O canister instead of just whipping cream with a beater or whisk is that using N2O produces whipped cream four times the volume of the liquid cream, while whipping the cream with a beater or whisk produces whipped cream two times the volume of the liquid cream, thus reducing the nutritive/caloric content of the N2O-produced whipped cream to half that of an equal volume of beaten or whisked whipped cream.
The company that made this, produced the equivalent of an IED or roadside bomb. I hope they are sued out of existence and all these devices are scrapped. I'm so sorry for the woman and her family. Another victim of senseless and useless technology. She was killed directly by whipped cream, rather than the way it kills many others with clogged arteries and heart attacks.
We have 2 of them. We've had them for 15 years. No problemo.
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