Franklin Electric Tri-Seal FPS4400 1B Series 304ss 4" Submersible Bore Pumps (Max 35LPM)

The Franklin Electric FPS4400 Tri-Seal 1B Series 4-inch Submersible Bore Pump is designed for dependable performance, superior sand-handling capability, and long service life in 4″ bores and larger. Featuring Franklin’s patented Tri-Seal™ floating stage system, this pump provides exceptional wear resistance and efficiency, even in wells with abrasive water conditions.

Each 1B Series pump is precision-crafted from 304 stainless steel, with Acetal and modified PPO thermoplastic hydraulics for optimum efficiency, durability, and protection against up-thrust and sand wear. The floating stage design allows each impeller to move independently, reducing friction and maintaining consistent performance. When paired with Franklin’s corrosion-resistant 4" submersible motor, the FPS4400 1B Series delivers smooth, quiet, and reliable operation for domestic, irrigation, and rural water supply systems.

FEATURES

• Tri-Seal™ Floating Stage System for enhanced abrasion and sand resistance
• 304 SS construction of key components for corrosion protection and durability
• 300 Series SS hub allows impeller float while maintaining a positive seal
• Phenolic washer provides reliable down-thrust protection
• Acetal impellers deliver high efficiency and superior wear resistance
• Modified PPO diffuser and disc resist abrasive wear and maintain flow performance
• Floating impeller stages reduce thrust load and improve longevity
• Removable spring-loaded check valve for easy maintenance and backflow prevention
• Ceramic shaft sleeve and rubber discharge bearing protect against sand wear
• Patented impeller hub seal system provides radial and axial sealing to minimise recirculation
• Compatible with Franklin Electric corrosion-resistant 4" submersible motors

SPECIFICATIONS

• Model: FPS-1B Series (Tri-Seal)
• Maximum Flow: 35 LPM (2.1 m³/h)
• Discharge Head: Up to 120 m (depending on model)
• Motor Power Range: 0.37 – 1.5 kW (½ – 2 HP)
• Stages: 8 – 32
• Discharge Port: 1¼″ BSP
• Maximum Water Temperature: 49 °C (120 °F)
• Maximum Diameter: 99 mm (with cable guard)
• Check Valve: Spring-loaded and removable
• Shaft Sleeve: Ceramic
• Materials: 304 SS / Acetal / Modified PPO / Phenolic

APPLICATIONS

• Domestic and rural water supply systems
• Stock watering and irrigation
• Pressure boosting and tank filling
• Rainwater harvesting and water transfer

INCLUSIONS

• Franklin Electric FPS4400 1B Series 304 SS Submersible Pump End
• Franklin Electric 4" Submersible Motor (optional selection)
• Spring-loaded check valve assembly
• User Manual