Overview

The Attwood Marine 4143PF1 is a 12V shower sump system with a multi-port box and Packard connector for moving gray water from a shower pan or sink drain to a 3/4 inch discharge line. It is the 750 GPH version in Attwood's larger sump box format, which makes it a practical fit when one box needs to manage more than a single drain.

The box measures 13 inches long, 7-3/8 inches wide, and 4-7/16 inches high. It accepts 3/4 inch, 1 inch, 1-1/8 inch, and 1-1/2 inch inlet hose sizes, and the outlet is sized for 3/4 inch I.D. hose. That helps when a boat uses different drain hose sizes between a shower stall, head sink, and galley sink.

The top lifts off for filter access, the lid gasket helps keep the box sealed at the top, and the built-in air vent helps reduce the air-lock problems that can interrupt sump discharge underway or at the dock.

Key features

• 12V shower sump system with Packard connector
• 750 GPH multi-port sump in the larger box size
• 3/4 inch I.D. outlet connection
• Inlet options for 3/4 inch, 1 inch, 1-1/8 inch, and 1-1/2 inch hose
• Multi-port layout for tying in more than one drain
• Air vent built into the box to help prevent air lock
• Snap-off lid with removable filter access for routine cleaning
• Box size of 13 inches x 7-3/8 inches x 4-7/16 inches

Installation and fit

This sump needs to sit lower than the shower drain and any other drain lines feeding it. For steady pump-out, the outlet hose should rise continuously from the box to the thru-hull without low spots, and the inlet hoses should rise smoothly from the sump toward their drains. Those routing details matter on boats where hose runs have to pass around stringers, tankage, or liners.

The larger box footprint is worth checking before replacement on compact bilge or utility spaces. Leave enough side access to release the lid tabs and enough clearance above the box to remove the cover and clean the filter without having to pull the whole unit back out.

Electrical and system fit

This version is for 12V DC systems only. The Packard connector is one of the main fit points to confirm before ordering, especially when replacing an existing shower sump on a production boat where the factory harness is already terminated for that plug style.

Use on board

This layout makes sense for cruisers, express boats, and small yachts where one serviceable sump box is used to collect shower water and secondary sink drains in the same part of the hull. It is also a sensible match when easy filter access matters because the box will need periodic cleaning from hair, soap residue, and everyday gray-water debris.