KOFIL R12T Marine Fuel Water Separator Filter — 10 Micron 15 GPH, 3/8" Barb × 1/4" NPT Fittings

The KOFIL R12T is a complete marine fuel water separator assembly that removes water and debris from gasoline or diesel before it reaches your outboard motor.

Whether you run a small fishing boat or a larger outboard-powered craft, keeping fuel clean is essential for reliable starts and long-term engine health. The R12T combines a rust-resistant housing with a dense, three-layer 10-micron element and included fittings so you can swap it in for common replacements such as S3240 and 120AT. It delivers up to 15 gallons per hour flow and ships with the parts needed to install right away.

How does the R12T protect my outboard engine?

The separator traps free water and captures particles down to 10 microns, preventing contaminants from reaching injectors, carburetors, and pumps. Its multi-layer pleated element increases surface area for longer service life and more stable flow under load.

• 10-micron filtration rating for fine particle capture
• Three-layer pleated element for higher debris capacity
• Rust-resistant coating on the bowl to resist corrosion
• Removes up to 99% of free water when installed correctly

What comes in the box and how easy is installation?

The unit arrives ready to fit: the R12T assembly, two 3/8" barb × 1/4" NPT male fittings, two plugs, and a roll of sealant tape. The included fittings match common fuel lines on outboard motors, making replacement straightforward for DIYers and technicians alike.

• 1 x assembled R12T fuel/water separator
• 2 x 3/8" barb × 1/4" NPT male fittings and 2 x plugs
• 1 x sealant tape for leak-free threaded connections
• Designed to replace S3240 and 120AT-style assemblies

How often should I service or replace the filter element?

Service interval depends on usage and fuel quality; KOFIL recommends replacing the filter element approximately every 500 engine hours or every 10,000 miles equivalent, whichever comes first. Check the separator periodically for visible water and sediment and change the element sooner if fuel contamination is heavy.

• Suggested replacement: every 500 hours or ~10,000 miles
• Inspect after refueling from uncertain sources
• Drain collected water regularly per your engine manual
• Replace sooner in saltwater or high-debris environments

Will the R12T fit my engine and what are its flow limits?

The R12T suits many gasoline and diesel outboard engines and is built to handle up to 15 gallons per hour. Verify your engine's required flow rate and inlet/outlet thread sizes before purchase to ensure compatibility.

• Maximum flow rate: 15 GPH (gallons per hour)
• Micron rating: 10 microns
• Fittings: 3/8" barb × 1/4" NPT male included
• Replaceable element design for straightforward maintenance

Who is this for? The KOFIL R12T is made for boat owners, anglers, small commercial operators, and marine technicians who need an affordable, effective fuel/water separation solution compatible with popular outboard systems. If you want to reduce downtime, protect fuel-system components, and install a drop-in replacement for S3240 or 120AT-style filters, this assembly provides a ready-to-install option with corrosion-resistant styling and a high-capacity pleated element. For installation questions or fitment confirmation, contact the seller or your service technician before fitting.