5503-TOICO-B666 Diaphragm Pump

12V High-Flow / High-Pressure Series 550 Pump

The 5503-TOICO-B666 is a high-output 12V diaphragm pump designed for applications requiring maximum flow and higher pressure performance. Built on the proven Series 550 platform, this model delivers increased capacity compared to standard configurations, making it ideal for demanding TOICO systems and high-volume fluid transfer.

Featuring a 5-chamber diaphragm design, this pump provides smooth, consistent flow while maintaining the ability to self-prime and run dry without damage. Its rugged construction and integrated thermal protection ensure long-lasting, reliable operation in the field.

Key Features

• Enhanced Flow Performance – Up to 4.0 GPM open flow
• High Pressure Capability – Up to 70 PSI operation
• Self-Priming Design – Up to 11 ft vertical lift
• Dry-Run Capable – Protects pump during intermittent supply
• Thermally Protected Motor – Prevents overheating and extends life
• NSF Certified Materials – Safe for potable water applications
• Heavy-Duty Construction – Built for continuous and high-demand use

Performance Specifications

• Model: 5503-TOICO-B666
• Voltage: 12 VDC
• Open Flow: 2.5 – 4.0 GPM
• Flow @ 70 PSI: 1.0 – 2.1 GPM
• Max Pressure: Up to 70 PSI
• Max Liquid Temperature: 140°F (60°C)
• Max Inlet Pressure: 60 PSI

Motor & Electrical

• Motor Type: Permanent magnet, totally enclosed
• Voltage: 12 VDC
• Leads: 14 AWG, 12" length
• Thermal Protection: Limits motor shell temperature to ~145°F (63°C)
• Duty Cycle: Based on load and heat rise characteristics

Pump Design & Materials

Built for durability in harsh environments:

• Pump Type: 5-Chamber Diaphragm
• Housing: Polypropylene
• Valves: EPDM
• Diaphragm: Santoprene
• Fasteners: Stainless Steel

Priming & Operation

• Self-Priming Capability: Up to 11 ft (model dependent)
• Continuous Operation: Supported within rated current range
• Thermal Protection: Auto shut-off when overheating occurs, with reset after cooldown

Ports & Connections

• Port Options:
  • Quick Disconnect
  • 1/2" NPT (Female)
• Hose Sizes Available:
  • 1/2", 5/8", 3/4"
• Configurations: Straight or elbow fitting

Does not include fittings because of various options.