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On/off ball valve. Ball valve QH-QS-4-1/8 with QS push-in connector. Hand lever and female thread. These are the on/off valves we use for our PRO Range of air scribes. They are very well made, sturdy, easy to use and reliable.
1/8 BSP" male thread and 4mm OD push fit (for 4mm polyurethane hose).
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