I didn't feel like paying $200 for a tube of aluminum, some rubber hose and fittings from Peak Diesel. Instead, I gave a drawing to a welder at my dad's plant a couple of months ago. Here's what he came up with.



All that's left to do is get a small filter and drill and tap holes for a petcock drain and the inlet fitting for the breather hose.

 

Drain and inlet holes drilled and tapped and fittings are in. Just need to pick up a small breather filter.