SEAFLO 21 Series diaphragm pump with orange pump head, black motor and retail box.
SEAFLO 21 Series diaphragm pump with orange pump head, black motor and retail box.
SEAFLO 21 Series diaphragm pump with orange pump head, black motor and retail box.

SEAFLO 21 SERIES 12V WATER PUMP

The Seaflo 21 Series 12V water pump provides on-demand freshwater delivery in a compact unit for boats, caravans and small water systems. Its self-priming diaphragm design draws water from the supply tank, while the pressure switch starts and stops the pump as an outlet is opened and closed. Its compact body fits into smaller water-system installations and is intended for intermittent use.

✓ Maximum flow: 3.8L/min
✓ Shutoff pressure: 40psi
✓ Connections: 3/8" hose barbs
✓ Supply: 12V DC
✓ Supplied hose barbs: 3/8" and 1/2"

Seaflo 21 Series Water Pump Specifications
Seaflo 21 Series Installation Manual

More Information
Product Specifications
SEAFLO 21 Series diaphragm pump with orange pump head, black motor and retail box.
SEAFLO 21 SERIES 12V WATER PUMP
SEAFLO 21 Series diaphragm pump with orange pump head, black motor and retail box.
Seaflo WPS 1.0PM 12V 21 Series PUMP-SFDP1-010-040-21
$60.48 /each

The Seaflo 21 Series supplies freshwater to caravan and boat outlets, with a maximum flow of 3.8L/min and a 40psi shutoff pressure. Its 12V supply and small pump body suit installations where space is limited.

The pressure switch starts the pump when an outlet opens and stops it when pressure builds after the outlet closes. The self-priming design draws water from the supply tank. Supplied 3/8" and 1/2" hose barbs connect the pump to the water lines.

Designed for intermittent use. Flow decreases as delivery pressure rises; maximum flow and shutoff pressure are separate limits.

Seaflo 21 Series Water Pump Specifications
Seaflo 21 Series Installation Manual

✓ Product Type & Application
Self-priming diaphragm demand pump for freshwater supply in boats, caravans and small water systems.
Model: SFDP1-010-040-21

✓ Capacity & Performance
Maximum flow: 3.8L/min
Shutoff pressure: 40psi
Maximum flow and shutoff pressure are separate limits; flow decreases as pressure rises.

✓ Flow at Pressure
SFDP1-010-040-21 | 12V
0psi: 4.14L/min
10psi: 3.28L/min
20psi: 2.84L/min
30psi: 2.60L/min
40psi: 0.00L/min

✓ Connections & Compatibility
Connections: 3/8" hose barbs
Supplied hose barbs: 3/8" and 1/2"

✓ Electrical & Leads
Power supply: 12V DC

✓ Duty
Intermittent: the pump needs cooling breaks between runs. It is not designed to keep pumping without stopping.

✓ Operation & Control
Automatic pressure-switch control: starts as an outlet opens and stops when shutoff pressure is reached.

✓ Dimensions & Mounting
Overall length: 169mm
Side-view height: 79mm
Mounting centres: 55mm
Mounting hole diameter: 5mm
O-ring port configuration width: 100mm
Fixed-barb configuration width: 98mm
Fixed-barb body width: 73.5mm
Front-view height: 62mm

✓ Construction & Features
Two-chamber diaphragm assembly.
Self-priming.

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