SEAFLO 12 GPM Diaphragm Hand Pump — 12 GPM Manual Marine/RV Pump, 1.3" Outlets, EPDM Diaphragm

The SEAFLO 12 GPM Diaphragm Hand Pump is a high-capacity, manual utility pump designed to deliver up to 12 gallons per minute for marine, RV, and off-grid use.

Built to withstand saltwater, freshwater and general utility chores, this hand pump combines lightweight construction with a durable diaphragm to provide reliable, easy-to-operate pumping where power may not be available. Its glass-filled polypropylene body and EPDM diaphragm resist corrosion and chemicals, while stainless fasteners add long-term durability. The pump’s large 1.3" ID house outlets and a generous flow rating make it suitable for bilge, livewell or transfer tasks.

How much flow and performance can I expect from this pump?

This SEAFLO model is rated at 12 GPM (gallons per minute) under typical manual operation, giving you strong throughput for quick draining or transferring. Flow depends on stroke speed and head height, but the wide outlets help maintain steady performance even at lower pump rates.

• Nominal flow: 12 GPM for efficient transfer and bilge work
• Large 1.3" ID house outlets minimize restriction
• Manual diaphragm action sustains flow independent of electrical power
• Good for short runs and tasks requiring burst flow

What materials and construction make it durable in marine environments?

The pump is engineered with corrosion-resistant components to withstand harsh environments. The body is molded from glass-filled polypropylene for stiffness and chemical resistance, while the diaphragm is EPDM, chosen for flexibility and resilience.

• Pump body: glass-filled polypropylene for impact and chemical resistance
• Diaphragm: EPDM rubber to resist flex fatigue and seawater exposure
• Fasteners: stainless steel to prevent rust and corrosion
• Lightweight construction that still stands up to rough use

How easy is it to install and maintain this hand pump?

Installation is straightforward thanks to the standard outlet sizing and a compact footprint that fits many mounting locations. Maintenance is minimal: periodic inspection of the diaphragm and fasteners keeps the pump working reliably, and replacement parts are typically simple to source.

• Standard 1.3" ID outlet fits common hose sizes
• Compact mounting footprint for flexible installation
• Simple inspection: check diaphragm and stainless fasteners occasionally
• Diaphragm and parts are serviceable for long life

What warranty and support does SEAFLO provide for this pump?

SEAFLO backs this hand pump with a 4-year warranty, reflecting confidence in its materials and workmanship. If issues arise, SEAFLO’s warranty and parts network provide recourse for repairs or replacements within the warranty terms.

• 4-year warranty included with purchase
• Manufacturer support and replacement parts availability
• Durable materials reduce likelihood of early failures

Who is this for: The SEAFLO 12 GPM Diaphragm Hand Pump is a practical choice for boaters, RV owners, outdoor enthusiasts and anyone needing a dependable, non-electrical pump for bilge control, livewell circulation, water transfer or emergency use. It suits users who want a high-flow manual option that balances lightweight design with corrosion-resistant materials and a multi-year warranty.