I purchased this kit many years ago when I was still working. I believe in Toronto but I don't remember where. I think I paid $30 or $40 for it. The O rings are fuel proof and of course oil and grease proof. I have used them to seal all sorts of old grease fittings and areas in and on carbs that they couldn't seal originally except using cork or paper. I've even put them in places where grease or oil was leaking through and there was no seal originally. Just a thought to help fix some of the poor sealing on our old Plymouths.