Please pardon the crude drawing. I priced all the parts to makre it and it would easily tie in to my existing snork set up. It would be air tight and only cost $65. It would be on the heavy side but you could adapt or lengthen to use any filter you want. anyone see why it wouldnt work? The tee's only come in a 6x6x4 but they make a 4x2 bushing which would work better for going into the snorkels.