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All mine have a taper that matches the taper on a disposable medical syringe.

They can be fed "little and often" with such a syringe, or by wedging a piece of firm but flexible plastic tube into the taper. The tube has a squeeze bottle plant spray at the other end. If you find the steam pressure too high for your syringe thumb, go DOWN a size.

I use similar syringes to top up spirit and steam oil, typically 10ml for spirit, which isn't under pressure, 5ml for water into the Goodall Valve, and 2ml for thick viscous steam oil.


David 1/2d
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