R12H Marine Fuel Water Separator — Complete System Guide
How the R12H System Works
The R12H is a modular fuel water separator system. Unlike sealed competitors that force you to replace the entire unit every service, the R12H separates into two parts:
The Assembly (Buy Once)The aluminum housing, mounting base, fittings, and collection bowl — built to last for years in harsh marine environments.
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The Filter Element (Replaceable)The 10-micron cartridge that does the actual filtration. Swap it in minutes — no tools, no mechanic, no replacing the whole unit.
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Why the R12H Saves You Money (The Math)
| System | Year 1 Cost | Year 3 Cost | Year 5 Cost |
| R12H System | $39.99 + 2x$13.99 = $67.97 | $39.99 + 6x$13.99 = $123.93 | $39.99 + 10x$13.99 = $179.89 |
| Sealed Competitor (@$40/unit) | 3x$40 = $120 | 7x$40 = $280 | 11x$40 = $440 |
| You Save | $52 | $156 | $260 |
R12H vs R12T — What's the Difference?
| Feature | R12H (New) | R12T (Old) |
| Filter Element | Detachable - replace cartridge only | Sealed - replace entire housing |
| Housing Material | Aluminum + powder coating | Iron (rusts in marine environment) |
| Cost per Service | $13.99 | $30-40 (full unit) |
| Replaces Part # | S3240 / 120AT / 18-7987 / RK10222 | |
Who Needs the R12H?
- Boat owners (inboard/outboard)
- Diesel truck fleet operators
- Marine generator maintenance
- Fuel storage & transfer systems
- Commercial fishing vessels
- Yacht & sailboat maintenance
- Agricultural diesel equipment
- DIY marine mechanics
Choose Your R12H Setup
Complete Combo
$39.99
R12H Assembly
+ 3 Filter Elements
+ Fittings & Plugs
+ O-Rings
Everything you need to get started
1-Pack Element
$13.99
Single Cartridge
10 Micron
Drop-in Fit
DIY 10-min Swap
Perfect for a single service
BEST VALUE
2-Pack Bulk
$21.00
2 Cartridges
Save 25% vs Single
Always Have a Spare
10 Micron
Best value for regular maintenance
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Common Questions
Q: I have the old R12T — can I use R12H filter elements?
A: No. You need to upgrade to the R12H assembly first. The R12T is a sealed unit. Start with the Complete Combo.
Q: How often should I replace the filter element?
A: Every 100 operating hours or annually, whichever comes first. Check the transparent bowl monthly for water accumulation.
Q: Does this fit my [Yamaha/Mercury/Volvo Penta] engine?
A: The R12H uses standard NPT/ZG1/4-19 ports and replaces S3240/120AT form factors — compatible with most marine diesel and gasoline fuel systems that accept spin-on filters.
Q: Is professional installation required?
A: For boats — no! DIY-friendly with included instructions. For automotive/diesel truck applications, professional installation is recommended.
Q: Wholesale pricing available?
A: Yes! Contact us for bulk pricing on assemblies and filter elements for fleets, marinas, and dealers.
iFJF Direct — Marine & Diesel Fuel System Specialists | Replaces S3240 / 120AT / 18-7987 / RK10222