Out of stock
SKU: CW43917
UPC: 022697414342
MPN: 4143-4
The Attwood Shower Sump Pump System (V750) is a complete 12-volt drainage unit built to clear gray water from onboard showers, head sinks, and galley sinks on cruisers, sailboats, and other cabin-equipped vessels. Rated at 750 gallons per hour, the sump box collects accumulated water and pumps it overboard automatically as the box fills. It is a sealed, self-contained system rather than a loose pump, which makes it a practical drop-in for boats that need reliable gray-water handling without a complex install. We stock it among our marine plumbing and ventilation components for builders and refit work.
Inside the box sits a mercury-free float switch wired to the pump, so the system starts and stops on its own as water rises and drains. A check valve in the inlet manifold keeps the pump from short-cycling and reduces the standing-water odor common to neglected sumps. An integrated air vent prevents air locks that would otherwise stall flow. The clear, gasketed lid snaps into place for quick installation and seals the box against overflow, while letting you see the water level at a glance. The inlet manifold carries multiple ports that can be trimmed to fit hose from 3/4 inch up to 1-1/2 inch, and the discharge port is fixed at 3/4 inch. Outer dimensions run 5 inches high by 9 inches wide by 14 inches long, per manufacturer specifications.
Use the V750 wherever a boat collects water below a fixture that can't drain by gravity, most often a shower pan or a sink in the head. The automatic float means you set it once and let it manage the sump on its own through the season. Match the inlet ports to your existing drain hose and route the 3/4-inch discharge to a thru-hull above the waterline. If you're outfitting a system around it, pair it with the right marine hose, thru-hull fittings, and a backup bilge pump for the lowest part of the hull.
Yes. The sump box houses a mercury-free float switch wired to the pump. As gray water collects and the float rises, the pump starts and removes the accumulated water, then shuts off on its own. You don't need a separate manual switch for normal operation.
The inlet manifold has multiple ports that can be trimmed to accept input hose from 3/4 inch up to 1-1/2 inch, so you can match it to most existing drain lines. The discharge port is fixed at 3/4 inch and should be routed to a thru-hull above the waterline.
The check valve sits in the inlet manifold and keeps water from flowing back into the box. This prevents the pump from repeatedly short-cycling and cuts down on the standing-water odor that builds up in neglected sump systems.
It drains fixtures that sit below the point where water can leave by gravity, most commonly a shower pan, head sink, or galley sink. The sealed box collects the water and the 12-volt pump moves it overboard at up to 750 gallons per hour.
The unit measures 5 inches high by 9 inches wide by 14 inches long and weighs about 3.4 pounds. The larger box volume allows faster water flow into and out of the sump compared with smaller-capacity units.
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