Description
Marine-Grade Fuel Water Separator — Protect Your Engine, Save on Maintenance
R12H Marine Fuel Water Separator — 10 Micron, 15 GPH, Aluminum Alloy, Replaces Racor S3240 / 120AT, NPT ZG1/4-19. Upgraded detachable filter element design: replace only the cartridge, keep the housing — saves up to 60% vs. disposable units. Complete kit includes aluminum housing, 3 filter elements, 4 O-rings, 2 inlet/outlet fittings, and 2 plugs.
Key Features
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Detachable Spin-On Design — Replace only the filter element, not the entire unit. Quick tool-free cartridge swaps.
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Aluminum Alloy Body + Powder Coating — Superior corrosion resistance against seawater and harsh marine environments. Built to outlast iron/steel alternatives.
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15 GPH High Flow Rate — Engineered for high-performance marine and diesel applications. Maintains fuel pressure under load.
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10-Micron Advanced Filtration — High-capacity filter media removes water and particles as small as 10 microns for clean, water-free fuel delivery.
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Transparent Nylon Collection Bowl with Drain Valve — Visually inspect water accumulation and drain with a simple twist of the black valve.
R12H vs R12T — Why the Upgrade Saves You More
| Feature |
R12H (Upgrade) |
R12T (Original) |
| Housing Material |
Aluminum alloy + powder-coated anti-corrosion finish |
Standard metal housing |
| Filter Element |
Replaceable cartridge (swap only the element) |
Sealed one-piece (replace whole housing) |
| Per-Service Cost |
As low as $10 per filter change |
Whole-housing replacement, higher cost |
| Reorder Discount |
Repeat customers can request a filter discount coupon — replacement costs even less |
— |
| Saltwater Resistance |
✅ Powder-coated finish resists salt spray |
❌ Prone to seawater corrosion |
Built for Saltwater
The R12H aluminum housing is finished with a marine-grade powder coating that resists corrosion from salt spray, humidity, and harsh offshore conditions — built to outlast plain metal separators in coastal and commercial marine service.
What's Included (Complete Combo)
- 1 x R12H Fuel Water Separator Assembly (aluminum housing + base)
- 3 x Filter Elements (1 installed + 2 bonus spares)
- 4 x O-Rings (2 installed + 2 bonus spares)
- 2 x NPT/ZG1/4-19 Connection Fittings
- 2 x Plugs for unused ports
- Installation Instructions
Specifications
| Model |
R12H (R12T Upgrade) |
| Material |
Aluminum Alloy + Powder Coating |
| Flow Rate |
15 GPH (57 LPH) |
| Filtration |
10 Micron |
| Port Size |
NPT / ZG1/4-19 |
| Filter Type |
Spin-On, Replaceable Cartridge |
| Replaces Part # |
S3240, 120AT, 18-7987, RK10222, R12T |
| Applications |
Marine boats, diesel trucks, generators, oil storage equipment |
Easy Installation — No Professional Tools Required (Boats)
Designed for DIY boat owners. Comes with detailed step-by-step instructions:
- Apply fuel to both O-rings for lubrication before assembly
- Mount the unit securely — use screws on a wood board (min 1cm) with marine adhesive if you prefer not to drill into your boat
- Fill the filter housing completely with fuel before starting the engine to prevent air-lock
- Periodically check the collection bowl and drain accumulated water via the drain valve
For automotive/diesel truck installation, professional installation is recommended.
Frequently Asked Questions
Q: What is the difference between R12H and R12T?
A: The R12T has a sealed, non-removable filter element — you must replace the entire housing. The R12H has a detachable cartridge: keep the housing, replace only the internal filter, saving you money every service.
Q: Will the fittings seal properly?
A: Yes, when installed correctly. The 4 ports use straight (parallel) BSPP threads rather than tapered NPT. For a leak-free seal, wrap each fitting with fuel-rated (yellow) PTFE thread tape or a diesel-resistant thread sealant — do not use standard white plumber's tape, which degrades in diesel fuel.
Q: Will this fit my boat or engine?
A: Yes. As long as you have sufficient mounting space, it works for boats, diesel trucks, tractors (a popular Kubota BX upgrade), generators, and fuel storage equipment. Ports: NPT/ZG1/4-19.
Q: Why won't my engine start after installation?
A: You must fill the filter housing completely with fuel before starting. An empty filter causes air-lock and starting failure.
Q: How often should I replace the filter element?
A: Every 100 hours of operation or annually, whichever comes first (roughly 15,000 km in diesel applications). Check the transparent bowl regularly for water accumulation.
Q: Is this compatible with Racor / Sierra / Yamaha systems?
A: This replaces S3240 and 120AT filter elements commonly used across marine brands. Verify your port size (NPT/ZG1/4-19) and mounting space before ordering.
WHOLESALE INQUIRIES
Bulk pricing available for marine dealers, fleet operators, and distributors. Contact us for wholesale discounts.
R12T Fuel Filter Water Separator Complete Combo Kit →
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