I have one, love it. This was the first one of it's kind available, all the others you see elsewhere (like eBay) came after this one. For those who don't know the story, a member over on another forum developed this for himself, then after a lot of requests had more made and sold them. It fits directly in place of the stocker, no need to get a smaller battery or anything. You will need a small piece of hose that goes on that barb (can't recall what it attaches to), otherwise as OP said you just reuse the stock clamps.
So this has been a long-winded (hopefully informative) bump!