And the winners of the July/August WTHII game with the actual answer are.............

About two dozen people knew that the July/August WTHII gadget was the Dap Cap! We picked a dozen winners at random. Who knew we had so many DYI'ers in our audience! 

It's a DAP Cap caulk finishing tool. Bob McAdams

My guess is that the yellow object is a “Caulk Finishing Tool.” The Rocket Ranger

It is a caulk smoother tool. Makes it straight and even. David Eckard

I believe that's a caulk trowel. Eric Selje

Caulking smoothing tool. Cel Begshaw

caulk application tool and tube plug. Ryan

I believe the pictured item is a fingertip tooling knife for caulking. Glen Celmer

That is a Caulking Cap / Finishing Tool. Derryl McDowell

DAP Cap Caulk Finishing Tool — PizzaGew, Lake Nacimiento, CA

Its a caulk spudger. http://www.homedepot.com/p/CAP-Caulk-Finishing-Tool-209293/203915184 John Bailey

I do believe this is a tool for smoothing out caulk, you stick your finger in, drag it along with the triangle end and get a nice smooth bead. Sam

caulk finishing tool, used to apply a smooth finish to ooey-gooey silicone caulk. Big Jim Donaldson

These folks and the people on the cute, clever list below are winners. See the bottom on the next panel on how to collect your prize.