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Metal purge valve marble
The marble is an indispensable component of the valve of your hookah. This is the moving part that will allow to waterproof your hookah when you aspire and leave an air flow when you blow.
Valve marbles are standard and are suitable for most hookahs.
What's more irritating than a marble that stays in place when you blow? To improve the mobility of the marble, you can dip it into an oily solution (oil, etc...). You will thus make your marble function more fluid!