Multiquip Submersible Centrifugal Pump ST1 Series | 1/4 HP | Aluminum | Integrated Mechanical Float Switch | Max 27 GPM | Max 23 ft. Head | 115V | 10 ft. Cord | ST1F

Automatic, Compact Dewatering for Standing Water

The Multiquip ST1F 1/4 HP Submersible Pump is a compact centrifugal pump with an integrated tethered mechanical float switch designed for automatic removal of standing water. Suitable for construction sites, excavations, site drainage, manholes, flooded basements, rooftops, swimming pools, irrigation areas, and other water-removal applications, the ST1F provides dependable pumping performance without requiring manual pump operation.

Powered by a 115V single-phase motor, the ST1F delivers up to 18 GPM with a maximum head of 21 feet. Its compact aluminum housing, thermal overload protection, durable polyethylene impeller, triple lip seal system, and integrated polypropylene float switch provide reliable operation in demanding dewatering environments.

Product Features:

• 1/4 HP Motor: Heavy-duty electric motor provides reliable performance for portable dewatering applications.
• 18 GPM Maximum Capacity: Pumps up to 18 gallons per minute for efficient standing-water removal.
• 21-Foot Maximum Head: Provides up to 21 feet of total pumping head for versatile dewatering applications.
• Integrated Mechanical Float Switch: Tethered industrial float switch provides automatic pump operation as water levels rise and fall.
• 3/4-Inch GHT Discharge: Replaceable 3/4-inch GHT male discharge port provides a convenient hose connection.
• Compact Aluminum Housing: Corrosion-resistant aluminum casing provides durability and effective motor heat dissipation.
• 4.5-Inch Minimum Level With Float: Automatically dewaters down to approximately 4.5 inches when operating with the integrated float switch.
• 0.25-Inch Minimum Level Without Float: Can pump water down to approximately 0.25 inches when operated without the float switch.
• 0.12-Inch Solids Handling: Durable strainer base permits passage of debris up to 0.12 inch (3 mm) in diameter.
• Thermal Overload Protection: Internal protection helps prevent motor damage caused by overloading and running the pump dry.
• 115V Single-Phase Power: Operates on 115V, single-phase, 60 Hz power with a 10-foot molded power cord and NEMA 5-15P plug.

What Is a Submersible Dewatering Pump?

A submersible dewatering pump is designed to operate directly in the water being removed. The pump is placed into the flooded area and pushes water through the connected discharge hose instead of drawing water through a suction line.

The ST1F combines this submersible design with an integrated tethered mechanical float switch, allowing the pump to automatically start and stop as the water level changes. It is designed for construction, standing water, well casings, excavations, site drainage, manholes, flooded basements, swimming pools, irrigation, and other water-removal applications.

Understanding Flow Rate and Head

The ST1F provides a maximum pumping capacity of 18 GPM and a maximum total head of 21 feet. Actual flow will vary according to the total head and resistance in the discharge system, including hose length, elevation, fittings, and other restrictions.

Automatic Float-Switch Operation

The ST1F features a tethered industrial mechanical float switch that automatically controls the pump according to the surrounding water level. As the water rises, the float activates the pump, and as the water level falls, the float switches the pump off.

With the float switch installed, the ST1F has a minimum pumping level of approximately 4.5 inches. The float switch cable is 12 inches long, allowing the pump to operate automatically within its designed water-level range.

Low-Level Water Removal

When operated without the float switch, the ST1F can dewater flat surfaces down to approximately 0.25 inches. This low-level capability makes it useful for removing residual standing water from relatively flat surfaces after larger amounts of water have been drained.

Compact and Durable Construction

The ST1F features an industrial aluminum outer casing designed for effective motor heat dissipation. Its hardened abrasion-resistant polyethylene impeller, heat-treated carbon steel shaft, stainless steel hardware, durable strainer base, and permanently oil-lubricated triple lip seals are designed for dependable operation.

115V Electrical Operation

The ST1F operates on 115V single-phase, 60 Hz electrical power. The pump includes a 10-foot molded power cable with a NEMA 5-15P plug and strain relief. The motor uses Class F insulation, draws 2.8 running amps and 6.0 starting amps, and operates at 3,450 RPM.

Motor Protection and Sealing

Internal thermal overload protection helps protect the motor from damage caused by overloading and running the pump dry. The ST1F also uses maintenance-free dual-sealed lubricated motor bearings and a permanently oil-lubricated triple lip seal system for durability.

Operating Conditions

The ST1F is designed to pump liquids up to 104°F (40°C) and has a maximum submergence of 16.7 inches. The pump is not designed for use with salt water or chemicals and uses an oil-free mechanical shaft sealing arrangement.

Applications

The Multiquip ST1F is designed for water-removal applications including construction, standing water, well casings, excavations, site drainage, manholes, industrial applications, water supply from lakes and rivers, wastewater, quarries, flooded rooftops, irrigation, residential areas, flooded basements, swimming pools, decorative waterfalls, and fountains.

Warranty

The Multiquip ST1F pump is covered by a 90-day warranty from the date of purchase. Hoses are covered for 3 months from the date of purchase. Refer to the Multiquip New Product Limited Warranty for complete terms and conditions.

Why Choose the Multiquip ST1F Submersible Pump?