Rule 3700 GPH Automatic Bilge Pump

Item Number: 55S

These high capacity bilge pumps feature very heavy duty construction for both commercial and pleasure boat use. They are known for their trouble-free operation and reliability.

This pump has a 1-1/2" discharge outlet.

"Automatic" models pump when water is sensed in the bilge, and do not require a separate float switch.

"Non-Automatic" (traditional) models are activated by a separate float or panel mounted switch (sold separately).


  • 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
  • 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


  • Type:3700 GPH Automatic Bilge Pump
  • Discharge Port:1-1/2"
  • Voltage:12V
  • Weight:5.5 lb
  • Dimensions:8-1/4"H x 4-7/8" Dia.
  • Capacity:3700 gph
  • Fuse:25A
  • Current Draw:15.5A
  • Sensing Current Draw:0.76 Ah per Day
  • Model:55S
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