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Needle-valve sketch



http://www.masterbuilt.com/shop/Needle_valve.html

http://www.mme.wsu.edu/~va305/Valves2/Needle_Valve_1.htm

http://www.mme.wsu.edu/~va305/Valves2/Needle_Valve_1.htm

http://www.dm-m.com/marsh/marsh11.htm

Not all four relate strictly to aquaria, which is why I chose a wide selection, to help you come up with a suitable design.
Regards,
Tony.


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