Thx
@Stu, helpful vid but doesn't show all the fittings. Come to think of it,
@t-dub has a slightly different setup in his lab.
So
@Vital, 1st pic is a male faucet adapter to fit a faucet with a female inlet for its screen. Remove the screen holder and replace with a quick-disconnect adapter like this. 2nd pic shows the whole tool: Female quick-disconnect, the other end is threaded male. Attached to it is a male barb with threaded female connector, look closely and you can just see the barb inside the tubing, which is held in place by the radiator clamp. The rubber stopper is I think a #2, 5/8" diameter small end 3/4" diameter larger end, which fits perfectly into an HT female. The stopper is drilled out to the OD of the tubing, I stole this tubing from my Q whip stock, I don't remember offhand its dimensions but I'm guessing 7/16". (There's a thread about tubing, or check the Q thread.) The tubing is pushed through the drilled hole and cut off flush, you can see it in the 2nd pic. 3rd pic shows the whole setup.
I have a 1 gallon plastic cylindrical container 5x12" filled with Simple Green. Most HT's would fit in it. For cleaning I just put the HT into the container overnight. I keep the container under the sink. Next day I attached the tool to the faucet, lift out the HT draining the SG, move HT to the sink, holding the HT upright insert the plug (or lay the HT in the sink on a wash rag or whatever to protect it from the hard surface, similar to what you saw in the vid
@Stu posted), turn on water. The inside flushes and, if holding the HT upright, spills out the top down the outside of the HT to rinse it off too. Takes only a few minutes.
That's it.
EDIT: I made this a couple years ago, so my memory is a bit rusty. Nothing magic here, there are other plumbing pieces that could do just as well. I seem to recall the only challenge was drilling the stopper and inserting the tubing. I used a vise to hold the stopper for drilling. It's important that the hole be no more than the diameter of the tubing so it is snug and doesn't slip out (which it will do if loose when under water pressure). I think I got the tubing thru the hole by pinching and lubing the end, then once thru past the pinch it could be cut off.