Descripcion
The Stanley SM21 Submersible Pump is a compact, high-performance hydraulic dewatering pump designed for professional underwater and confined-space operations. Its small-diameter caisson-style body fits through tight openings (only 6¼ in / 15.9 cm wide), making it ideal for manholes, vaults, excavations, and other restricted access areas.
Built for rugged jobsite and commercial diving use, the SM21 features a self-priming, fully submersible design that can even run dry without damage, ensuring reliable operation in unpredictable conditions. A durable cast-iron impeller positioned close to the base helps remove more liquid than typical pumps, while the integrated lifting eye simplifies deployment and recovery.
Powered by a Stanley Hyrevz gear motor and corrosion-resistant stainless-steel fasteners, the SM21 delivers impressive flow for its size—up to 300 gpm (1135 lpm) through a 2½" NPTF discharge, giving crews fast, efficient water removal without the hassle of gasoline engines, recoil starts, or suction hoses.
Key Specifications
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Discharge size: 2½" NPTF
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Max performance: 300 gpm / 1135 lpm
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Hydraulic flow range: 4–9 gpm / 15–34 lpm
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Working pressure: 1000–2000 psi / 70–140 bar
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Full relief setting: 2250 psi / 155 bar
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Weight: 22½ lb / 10 kg
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Length: 16½" / 42 cm
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Width: 6¼" / 15.9 cm
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Hydraulic ports: 6 SAE O-ring
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Connections: 3/8" male pipe adapter, includes couplers and hose whips
