I have those, they work well but are sometimes too big for some of my zerks on the mini. So I made a short whip with a conventional coupler for the hard to reach zerks.
Every now and again they will loose prime but not a big deal. Pull the rod out 1/4 turn, push rod and hold the purge, slide rod back in, and pump yo grease.
I have and use and like the Legacy type dual speed GG. One setting of pressure and one for volume. Fairly easy to pump one handed even in the bitter cold.
But I went to a M18 and M12 one in each truck.
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