Yes they are available. I had one on my boat that switched port or starboard, but not both. I swapped it out for a y block that draws from both tanks since the switch was pretty restrictive. Someone probably make a less restrictive one than mine. It's just that I have upped the HP quite a bit from what it was stock, and the switch wasn't designed to flow as much as I need. The only problem is noe it doesn't draw evenly. I've though of putting shut-off valves upstream of the y in case one tank gets really low, but haven't gotten around to it yet. Tim