Both of my Kioti's came with it from my dealer. It might have been ordered by the dealer for the tractors he sells. It consists of a new smaller vent tube and fitting that attaches to a port on the left side upper back of the trans, and an adapter to replace the big red fill plug/vent that screws into the fill port on the right backside of the tractor. The right side adapter has a female QD, which plugs into the backhoe's male QD coming off the hoe's return line.
Instead of worrying about looking this stuff up why not ask your selling dealer(s) about how to go about getting the kit?!:confused2:
It's a couple of pieces, and can't cost much, BUT it does provide real benefit.