Johnson Pump 48903 Aerator/Livewell Pump, 1000 GPH, 12 Volt, Twin Outlet Ports

The Johnson Pump 48903 is a 12 volt, 1000 GPH aerator/livewell pump built to run both a livewell and a raw water washdown pump from a single intake. Its 3/4 inch tapered inlet connects directly to the sea cock, eliminating the need for a second through-hull fitting. The pump has twin outlet ports: the upper outlet provides a continuous flow of water through a 1-1/8 inch discharge to the livewell, while the lower outlet port connects to a washdown pump through either a 1/2 inch or 3/4 inch port.

A high pressure inlet seal is built into the pump to handle the higher pressures created by high speed pickups, which are common on boats using this type of dual-purpose plumbing setup. The housing is molded plastic in a black finish for corrosion resistance in a marine environment. This pump does not include a Dura-Port fitting.

Specifications

• Brand: Johnson Pump
• Manufacturer Part Number: 48903
• Category: Livewells and Bait Tanks
• Flow Rate: 1000 GPH
• Voltage: 12 Volts
• Inlet Size: 3/4 inch tapered inlet
• Lower Outlet Port: 1/2 inch or 3/4 inch (washdown pump connection)
• Upper Outlet Discharge: 1-1/8 inch (to livewell)
• Outlet Configuration: Twin outlet ports
• Maximum Lifting Height: 3 feet
• Color: Black
• Material: Plastic
• Weight: 0.9 pounds
• UPC: 729321489034
• Warranty: 90 days

Frequently Asked Questions

What is the flow rate of the Johnson Pump 48903? The Johnson Pump 48903 is rated at 1000 GPH and runs on 12 volts.

Can one intake feed both a livewell and a washdown pump with this pump? Yes, that is the main design purpose of the 48903: its single 3/4 inch tapered inlet connects to the sea cock, then the twin outlet ports split the flow, with the upper outlet feeding the livewell and the lower outlet feeding a washdown pump.

What size is the inlet on the Johnson Pump 48903? The 48903 has a 3/4 inch tapered inlet that connects directly to the sea cock.

What size are the outlet ports? The upper outlet port discharges through a 1-1/8 inch fitting to the livewell, and the lower outlet port connects to a washdown pump through either a 1/2 inch or 3/4 inch port.

Does the Johnson Pump 48903 include a Dura-Port fitting? No, the 48903 aerator/livewell pump does not include a Dura-Port fitting.

What material is the Johnson Pump 48903 housing made of? The 48903 housing is molded plastic, finished in black.

How much does the Johnson Pump 48903 weigh? The 48903 aerator/livewell pump weighs 0.9 pounds.

What voltage does the 48903 aerator pump run on? 12 volts DC powers the Johnson Pump 48903.

Why does the 48903 have a high pressure inlet seal? High speed pickups commonly used with this dual-outlet setup create elevated inlet pressure, so the 48903 uses a high pressure inlet seal designed to handle that increased pressure without leaking.

What is the maximum lifting height of the Johnson Pump 48903? 3 feet is the maximum lifting height for the 48903 aerator/livewell pump.

Is the Johnson Pump 48903 meant for saltwater or freshwater use? The 48903 is a raw water aerator/livewell pump intended for use with the boat's raw water intake through the sea cock, and its plastic housing is built for a marine environment.

What warranty comes with the Johnson Pump 48903? The Johnson Pump 48903 carries a 90 day manufacturer warranty.