i've seen a lot on there, but a lot look to be replica/knock offs. i saw the flange you're referring to, yea, i don't want that. any brands that work well that you can recommend? they have a lot of the bosch ones, but thats plastic, wasn't sure if it would work better or not. also they mention different sizes(in mm), is there anything in particular i should be looking for as far as size goes. or is it just the fact of it having the hose connection on both sides that i care about?