Rule Computerized 3700 Automatic Bilge Pump

Product overview

Rule's 3700 GPH (14010 LPH) automatic bilge pump (model 55S; the label reads 'Computerized 3700'), a 12 V DC submersible pump that needs no separate float switch. Every 2½ minutes it runs briefly, senses water from the load on its impeller and keeps pumping until the water is removed.

Part of Pumps & Plumbing: Rule bilge pumps and float switches; Jabsco water pressure and washdown pumps and a manual marine toilet.

Key specifications

Model

Rule 55S

Brand

Rule

Models

55S (12 V DC only)

Rated capacity

3700 GPH (14010 LPH)

Voltage

12 V DC

Operation

Automatic: checks for water every 2½ minutes; no float switch needed

Hose

1-1/2 in (38 mm)

Size

Height 209.5 mm (8.25 in); width 124 mm (4.9 in)

Flow by head

3000 GPH (11355 LPH) at 0 m; 2300 GPH (8705 LPH) at 1 m; 1900 GPH (7200 LPH) at 2 m

Minimum supply

10.5 V

Wiring

3 wires: automatic +, manual override +, negative

Strainer

Replacement model 279

Fuse

25 A

Current draw

15.5 A at 12 V

Figures as published by Rule (the maker’s page), checked 7 October 2026. Say the model and voltage you need with your quote.

Downloads

• MM Techno Plast catalogue 2026PDF, 7.9 MB, after a short formDownload