The 21-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing. The 21-series of diaphragm pumps are self-priming and can be run dry without harm. It provides 3.8 Litres per minute. Miniature multi-outlet water pressure pump serves 1 or 2 3/8” (10 mm) outlets at any one time. This compact automatic demand water system pump has a built-in pressure switch, which automatically starts and stops the pump when the faucet is opened and closed. 

Features and Benefits

  • 2 chamber diaphragm pump
  • Capable of supplying1-2 fixtures
  • Self-priming
  • Intermittent duty
  • 18AWG,13"long Leads
  • Ignition protected
  • Industry-standard mounting pattern
  • Meets or exceeds RoHS, SGS, and ISO standards
  • 3 Year Warranty

Suitable for

  • Yacht / RV / Caravan pressurised water system 
  • Sprayer fixtures (vehicle-mounted sprayers, electric sprayers)
  • Cleaning machines, humidifier, water purification, medical apparatus
  • Food beverage filling & liquid transfer
  • Solar water system 
  • Any other pressurisation system




Type 2 Chamber positive displacement diaphragm
pump, self priming, capable of being run dry
Control Type Pressure switch
Max Recommended Temperature 60° C (140° F)
Priming Capabilities 4 feet (1.2 m) suction lift
Re-start Pressure Shut-off Pressure 40 PSI: 30 PSI ±5 PSI (±0.3 bar)
Inlet/Outlet Ports 3/8" (10 mm) hose barb
Weight 1.3 lbs (0.6 kg)


Leads 18 AWG, 14" (35 cm) long with 2-Pin connector / Leads
Duty Cycle Intermittent
Max.Amp Draw 4.0 A
Fuse 6.0 A


SKU SFL.SFDP1-010-040-21
Model # SFDP1-010-040-21
Brand SeaFlo
Shipping Weight 0.7000kg
Shipping Width 0.200m
Shipping Height 0.070m
Shipping Length 0.110m
Shipping Cubic 0.001540000m3

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