Johnson Pump 28512 Motor Cartridge for 1000/1250 GPH Bilge Pump Housings, 12 Volt

The Johnson Pump 28512 is a 12 volt motor cartridge built as a direct replacement for 1000 GPH and 1250 GPH cartridge-style bilge pumps. Rather than replacing an entire pump housing, this cartridge lets you swap in a fresh motor while reusing your existing base and plumbing, which keeps installation quick and keeps replacement cost down. The housing is molded in black plastic for corrosion resistance in the wet, salt-exposed environment inside a bilge compartment.

This cartridge is rated for a maximum flow rate of 16.66 gallons per minute and runs on a 12 volt DC supply, matching the voltage used across the compatible cartridge pump line. It is designed with a universal fit for cartridge pump bases built around the 1000 GPH and 1250 GPH capacity rating, so before ordering, confirm that your existing pump base and cartridge slot match this dimension and capacity. Each unit ships as a single motor cartridge only.

Specifications

• Brand: Johnson Pump
• Manufacturer Part Number: 28512
• Voltage: 12 Volts
• Power Source: AC/DC
• Maximum Flow Rate: 16.66 gallons per minute
• Rated Capacity: 1000/1250 GPH cartridge pumps
• Color: Black
• Material: Plastic
• Product Dimensions: 4 inches L x 4 inches W x 4 inches H
• Package Dimensions: 7.5 inches L x 6 inches W x 3 inches H
• Weight: 0.69 pounds
• UPC: 729321285124
• Fit Type: Universal fit for 1000/1250 GPH cartridge pump housings

Fitment

• Fits 1000 GPH and 1250 GPH cartridge-style bilge pumps as a universal-fit motor cartridge replacement

Frequently Asked Questions

What pumps does the Johnson Pump 28512 fit? The 28512 motor cartridge is built as a universal-fit replacement for 1000 GPH and 1250 GPH cartridge-style bilge pumps. Confirm your pump's cartridge slot and capacity rating match before ordering.

Is the 28512 a full pump or just the motor? It is a motor cartridge only, not a complete pump. The 28512 replaces the internal motor cartridge in a compatible 1000/1250 GPH pump base while you keep your existing housing.

What voltage does this cartridge run on? The Johnson Pump 28512 runs on 12 volts, matching the standard voltage used on 1000/1250 GPH cartridge bilge pumps.

What is the maximum flow rate of the 28512? This cartridge is rated for a maximum flow rate of 16.66 gallons per minute when installed in a compatible 1000/1250 GPH pump housing.

How much does the Johnson Pump 28512 weigh? The 28512 motor cartridge weighs 0.69 pounds.

What material is the 28512 cartridge made from? The Johnson Pump 28512 has a black plastic housing, chosen for corrosion resistance in a bilge environment.

What are the dimensions of the 28512 cartridge? The 28512 cartridge measures 4 inches L x 4 inches W x 4 inches H, and ships in a package measuring 7.5 inches L x 6 inches W x 3 inches H.

What is included when I order the 28512? Ordering the Johnson Pump 28512 gets you one motor cartridge unit; it does not include a pump base or mounting hardware.

Is the 28512 a genuine Johnson Pump part? Yes, the 28512 is a genuine Johnson Pump motor cartridge, identified by UPC 729321285124.

Can I install the 28512 myself? The 28512 is designed as a drop-in cartridge replacement for compatible 1000/1250 GPH pump bases, so it can typically be swapped in without replumbing the pump housing, provided the cartridge slot matches.

Does the 28512 work with both 1000 GPH and 1250 GPH pumps? Yes, the Johnson Pump 28512 is rated for use in both 1000 GPH and 1250 GPH cartridge pump housings.