The Rule Mate RM500B 12V Automatic Bilge Pump combines compact design with smart water detection, eliminating the need for a separate float switch. With automatic activation at 2" (5cm) of water and shutoff at just 3/8" (0.9cm), this submersible bilge pump keeps your bilge dry with minimal power draw.
The RM500B features a significantly smaller footprint—around 2/3 the size of older models—making it perfect for tight installations. Built-in thermal cut-off protection safeguards the pump and your vessel from overheating.
Ideal for discharge heads up to 3 metres, the RM500B also includes intelligent backup technology: if oil or debris blocks the sensor, the pump automatically switches to a timed 2.5-minute cycle mode until normal operation resumes.
Key Features:
500GPH (1890 LPH) maximum flow rate
12V DC, draws just 1.8A–2.4A
19mm (3/4") outlet with included check valve
ISO 8846 (Ignition Protected) & ISO 8849 marine standards compliant
Compact size: 130mm length x 112mm height x 73mm width
Includes 60cm wire lead and non-return valve
Suitable for bilges on boats up to approx. 7m–8m in length