Doty said:
You don't know what that is? Well, it's a.... You know, it is for.... It fits on the back... and you use it to....... uhhhhh, Yep, that's it, it is what everyone needs.
I haven't a clue. It appears homemade, I was going to say it was a drawbar "extension", but then I saw the pieces that 90 degree up into the larger plumbing fittings - and then I started scratching my head.