Identify Attwood Marine Bilge Pumps

To identify an Attwood bilge pump, start with the old unit's voltage marking and outlet diameter. A Sahara Mk2 pump has an integrated automatic float, whereas an HD-series pump uses separate electrical control. A float switch and a hand pump are different pieces of equipment. Use the model comparisons below before substituting a similar-looking unit.

Identify the pump's operating system

External-control electric An HD electric pump has its own motor; automatic activation, if installed, is controlled separately.

Integrated automatic The Sahara Mk2 pump body incorporates a float-triggered mechanism, with distinct 12V and 24V models.

Switch or hand pump The standalone 4201-7 is only a control. The 11596-2 manual pump needs no electrical harness.

Simplified identification illustrations, not installation or wiring diagrams.

A rating in GPH is not the complete answer. The number on the pump nameplate may be a model class or a flow figure measured under specific conditions. Compare manufacturer flow at the required discharge height, not just the product title.

How to narrow down an unknown bilge pump

Photograph the old label and wiring before removing the damaged assembly, with power disconnected.
Check the hose barb: HD models shown use 1-1/8-inch hose, but Sahara Mk2 options differ by model.
Inspect for an integrated float or a nearby separate float switch. Confirm the bilge's working water level.
Compare 12V and 24V labels and the pump's required fuse and wiring configuration.
Use the exact MPN and product photo to compare the replacement's base and outlet position before ordering.

Check automatic control ratings. Attwood 4201-7 is rated up to 12A at 12V or 6A at 24V and has a protective float cover. It is not a bilge pump motor. Follow the manufacturer's wiring and protection instructions.

Compare the Attwood identification numbers

MPN	Series / type	Power	Control	Outlet or hose
4730-4	HD1700	12V DC	Electric; external control	1-1/8 in
4760-4	HD2000	12V DC	Electric; external control	1-1/8 in
5508-7	Sahara Mk2 S800	12V DC	Automatic; integrated float	3/4 or 1 in barb
5513-7	Sahara Mk2 S1200	24V DC	Automatic; integrated float	1 or 1-1/8 in barb
4201-7	Automatic float switch	12V or 24V DC	Separate switch; not a pump	No hose outlet
11596-2	Hand-operated bilge pump	Not electric	Manual; no wiring	Supplied 32-in hose

Two similar model names may require different voltage and hose sizes. The separate switch has no discharge port; the hand pump is not an electric bilge assembly.

Review the matching Attwood components

Use the images and manufacturer numbers to identify the part. Review each store listing for its condition and availability.

Identify a separate-control heavy-duty pump

The HD1700 and HD2000 names identify two separate powered models. If a float switch was installed nearby, it is not included in the pump housing.

Attwood 4730-4 HD1700 marine bilge pump catalog product photograph

Attwood 4730-4 — HD1700Look for the HD1700 body, rotating discharge area and 1-1/8-inch hose connection. Check the old pump's power lead and any separate float switch.Check listing and availability

Attwood 4760-4 HD2000 marine bilge pump catalog product photograph

Attwood 4760-4 — HD2000The HD2000 designation points to the larger-flow heavy-duty series. Check the 12V label and hose diameter; matching discharge size alone does not establish an electrical replacement.Check listing and availability

Check the integrated-float Sahara Mk2 family

Both examples incorporate float switching but are not electrically interchangeable. Check the manufacturer's part label and outlet choice.

Attwood 5508-7 Sahara Mk2 S800 marine bilge pump catalog product photograph

Attwood 5508-7 — Sahara Mk2 S800If the original pump has a float integrated into its compact body, compare Sahara Mk2 S800. Part 5508-7 is 12V with dual-size hose barb choices, not a 24V model.Check listing and availability

Attwood 5513-7 Sahara Mk2 S1200 marine bilge pump catalog product photograph

Attwood 5513-7 — Sahara Mk2 S1200Check the 24V marking and the larger discharge on the original unit. A 5513-7 should not be substituted for a 12V pump just because it shares the Sahara Mk2 housing style.Check listing and availability

Identify the separate switch and cover

The covered float switch is separate from the pump. Its model number, cable, and rating matter when replacing it.

Attwood 4201-7 Automatic float switch float switch catalog product photograph

Attwood 4201-7 — Automatic float switchA covered rectangular Attwood switch is a separate control, not a pump motor. The model number 4201-7 has 36-inch wiring and must be matched to the existing electrical circuit.Check listing and availability

Recognize the non-electric hand pump

A manual tube-style pump does not share fittings, voltage or control wiring with permanently mounted models.

Attwood 11596-2 Hand-operated bilge pump hand bilge pump catalog product photograph

Attwood 11596-2 — Hand-operated bilge pumpRecognize the long hand-operated cylinder and hose rather than a wired pump. Part 11596-2 is a portable manual pump for small boats, not a 12V or 24V electric unit.Check listing and availability

For model specifications and discharge-flow guidance, consult the Attwood manufacturer product catalog. A bilge pump is intended to remove normal accumulated water, not to compensate for hull damage or unsafe navigation.

See each UsedRVParts listing for condition and availability. Viewing and pickup in Kelowna are by appointment.

New & Updated RV Parts Inventory — Check Back Often

We’re always adding new and used RV parts to our inventory, so be sure to check back regularly.

If you don’t see the part you need today, we may still have it in stock—our internal database includes thousands of new RV parts that are not yet listed online.

Text or email us with the product number or model, and we’ll check availability for you right away.

Our Products

Identify Attwood Bilge Pumps by Voltage, Outlet & Switch Type