Finger actuated dispenser

Does anyone know who makes, or were to get a finger-actuated switch for a pneumatic dispenser? I used one years ago at a different company but for the life of me I cannot remember who makes it. I have looked in the typical places - Contact east, Techni-tool McMaster but cannot seem to find what I need. The switch I am looking for is on a round sleeve that fits over the end of the syringe. There is a screw to tighten the ring to the syringe and a small button that activates the dispenser instead of a foot pedal. Any help would be appreciated.

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