5503-TOICO-M638TI Diaphragm Pump

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

The 5503-TOICO-M638TI is a maximum-performance 12V diaphragm pump engineered for applications that demand the highest flow and pressure capabilities in the TOICO lineup. Built on the Series 550 platform, this model delivers significantly increased output, making it ideal for high-demand systems where standard pumps fall short.

With a 5-chamber diaphragm design, this pump provides smooth, consistent flow while maintaining the ability to self-prime and run dry without damage. Designed for heavy-duty operation, the M638TI is optimized for short-duration, high-output use cases where performance is the top priority.

Key Features

• Ultra High Flow Performance – Up to 5.3 GPM open flow
• High Pressure Capability – Up to 70 PSI operation
• Extended Priming Capability – Up to 13 ft lift
• Self-Priming & Dry-Run Capable
• Heavy-Duty Construction – Built for demanding, high-volume applications
• NSF Certified Materials – Safe for potable water systems
• Maximum Output Design – Highest capacity in the Series 550 lineup

Performance Specifications

• Model: 5503-TOICO-M638TI
• Voltage: 12 VDC
• Open Flow: 2.7 – 5.3 GPM
• Flow @ 70 PSI: 1.1 – 3.0 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: Not equipped with automatic thermal shut-off
• Recommended Max Surface Temp: 150°F (66°C)
• Duty Cycle: Based on load and monitored heat rise

Pump Design & Materials

Built for durability in extreme-use environments:

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

Priming & Operation

• Self-Priming Capability: Up to 13 ft
• High Output Operation: Designed for short bursts of maximum performance
• User-Managed Thermal Control: Requires monitoring due to lack of built-in thermal cutoff
• Recommended Cycling: Limited to avoid overheating during sustained use

Does not include fittings.