Now here’s a new wrinkle! You’ve seen duplex and even triplex fuel/water separators? Here’s a duplex sea strainer from Perko. Let’s say you need to run nonstop for several hours on a given day but halfway along your sea strainer basket gets clogged. No problem—you simply pull ’er back, go down to the engine room, switch over to the other side of this duplex unit (the side with the clean basket, of course) and deal with the clogged basket later on, when you’re in port or on the hook. Works off an existing through-hull fitting—no extra through-hull required.