3700 GPH UL Listed Bilge Pump - 12V, Non-Automatic, 6 ft Wire Leads (1-1/2" Hose)

Holding a prestigious UL listing, this pump can be used on passenger carrying vessels. It is engineered to commercial standards, and offers high pumping capacity and reliability. The Rule 3700 series is the most popular high volume output bilge pump; offering more pumping capacity and more exclusive design features than any comparable competitive pump.

This UL listed model is a "Non-Automatic" traditional-style bilge pump activated by a separate float or panel mounted switch (sold separately).
The pump has a 1-1/2" discharge outlet.

• Completely submersible
• Rust and corrosion protected
• Silent, vibrationless operation
• Moisture tight seals
• Anti-airlock protection
• Compact, energy efficient, long life motor
• Able to run dry without motor burn-out
• 6 ft wire leads
• Marine grade sealed wiring
• Easy to clean, snap-lock strainer base
• Stainless steel shaft
• Ignition protected
• CE and ISO 8849 certification
• 3-year limited warranty


Heavy on the technical side...

Note — The capacity of ALL centrifugal bilge pumps, regardless of manufacturer, is rated at "open flow" — with no hoses or resistance to impede output. In actual use, however, the work of lifting the bilge water out of the boat will decrease the output of the pump.
The higher the lift, the less the output.
For a typical larger bilge pump, expect an output decrease of approximately 5% per foot of lift.
For this Rule 3700 gph pump, the tested output is about 87% of rated capacity when the maximum height of the discharge hose (not the outlet thru-hull) is 3 ft above the pump, and about 75% of rated output at 6 ft above the pump, and 62% output at 9 ft.
Pump output is further decreased by long discharge runs, any elbows in the discharge line, internal corrugations in the hose selected, etc.

If you have any doubts about the ability of any bilge pump to meet the requirements of your installation, it is always prudent (and not much more expensive) to simply purchase a higher capacity pump.