This tool removes either Presta or Schrader valve cores. For Presta, you must have the type of valve that is removable, as not all Presta valves have removable cores. For Schrader, all of them are removable, as they are the same kind that is used for automobiles and motorcycles. A good use of this tool is when you wish to inject tire sealant into either your trike’s inner tubes, for those who run with tubes, or into your trikes tires, for those who run a tubeless setup.
Most trikers probably have inner tubes, so assuming your valve core is the removable type (either removable Presta or any Schrader), by removing the core you can then inject Orange Seal, Slime, Stan’s NoTubes, or some other brand of puncture proofing sealant into the tube. This will pretty much put an end to your days of flat tires (at least that is what the consensus of the cycling community has to say about it).