Eaton Fuller K-3331 Splitter Valve | OEM Replacement For Heavy Duty Transmissions

The K-3331 splitter valve from Tritenco is a reliable, OE-equivalent replacement designed to restore smooth, consistent split-shift performance to your Eaton Fuller heavy-duty transmission. Built to match OEM specifications, this K-3331 splitter valve installs without modifications and delivers leak-resistant operation for Mack, Freightliner, Navistar, and other heavy-duty trucks.

For fleet managers, service technicians, and owner-operators, consistent range shifting isn’t just a convenience—it’s essential for uptime and safety. The Tritenco K-3331 splitter valve is engineered to eliminate hard shifts, air leaks, and split failures that keep trucks off the road. Built as a direct replacement for Eaton Fuller transmissions, it works seamlessly with factory systems and supports reliable split-shift performance in the harshest operating conditions.

It is a direct OEM equivalent splitter valve for Eaton Fuller heavy-duty RTLO/RTLOF series transmissions, compatible with mainstream heavy truck models and aftermarket pneumatic systems.

Durable & Leak-Resistant Eaton Fuller Splitter Valve Design

This K-3331 splitter valve uses high-strength anodized aluminum alloy, enhanced with impregnation treatment for superior corrosion resistance and reduced air leakage. Because of precision-machining to strict OE tolerances, it fixes common splitter valve issues: hard shifts, missed gears, and costly downtime.

Every unit passes strict air leakage and function tests. It performs reliably in high-pressure pneumatic systems for Eaton Fuller RTLO/RTLOF series transmissions.

No matter if you run a fleet, own a repair shop, or source parts for distribution, you can rest assured that the Tritenco K-3331 Splitter Valve will fit and perform as expected. It matches the fit, function, and durability of the original part. It delivers trusted performance at a practical cost.

Install this splitter valve quickly and easily, with no modifications needed. It fits standard mounting holes and ports for fast, direct installation. It saves you time on every repair.

We focus on real-world performance, long service life, and consistent quality. This means your vehicles stay on the road, not stuck waiting for unreliable parts.

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K-3331 Splitter Valve: Heavy-Duty Performance for Commercial Trucks

Product Overview

• Brand: Tritencot
• Part Number: K-3331 (also compatible with K3331, FUL-K3331, A-6862, etc.)
• Condition: 100% New
• Compatibility: Fits Eaton Fuller RTLO/RTLOF series transmissions (513s, 613s, 713s, 913s, 618s, 718s, 918s); excludes RT/RTO-613/6613 models. Compatible with Mack, Freightliner, and other heavy-duty trucks.

Key Features

• OE-Equivalent Quality: Built to meet or exceed OEM specifications for durability and consistent shifting.
• Anodized & Impregnated Aluminum Construction: Resists high temperatures, corrosion, and reduces air leakage, rated for 60 PSI operating pressure.
• Direct Fit Design: Engineered for exact compatibility with RTLO series transmissions, no modifications required.
• Complete Service Kit: Includes all necessary components for drop-in replacement, reducing downtime.
• Seamless Integration: Works across a wide range of commercial vehicles and transmission models.

Technical Specifications

• Air Ports: 3x 1/8-inch NPT (inlet/outlet/control)
• Mounting: 4x 5/16-inch-18 bolts (1-7/8-inch length)
• Operating Pressure: 60 PSI (0.4137 MPa)
• Material: Anodized & impregnated sealed aluminum alloy
• Weight: 547 g (1.190 lbs)
• Size (L×W×H): 10×9×7 cm

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OE-Equivalent K-3331 Splitter Valve for Eaton Fuller Transmissions

Below is a full list of interchangeable OEM and aftermarket part numbers for the Tritenco K-3331 splitter valve, designed to fit Eaton Fuller heavy-duty transmissions:

Eaton Fuller Splitter Valve Cross-Reference Part Numbers

Manufacturer	Replacement Part Numbers
Eaton Fuller	4300927, 4304031, 4304032, A-6862, FUL-K3331, FURK3331, K-3329, K-3331, K3331B
World American	A6862, 3088-K-3331
Freightliner	FUL K3331
Navistar	FULK-3331, NSFSK3331
Timken	M13K-3331
Genuine Newstar(S&S)	S-10291, S10291, FUR-K-3331
Mack	3088-K-3331
PAI	900417

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K-3331 Splitter Valve: Direct Drop-In Replacement (No Modifications)

Package Includes

• 1 × Splitter Valve
• 3 × Sealing O-ring
• 1 × Connector

Compatibility Note

• This is an aftermarket replacement part. It is designed to be compatible with and replace genuine Eaton Fuller® and other OEM part numbers listed. All trademarks are property of their respective owners.
• Backed by Tritenco’s precision manufacturing and IATF 16949 quality system, the K-3331 splitter valve delivers reliable performance for fleets, repair shops, and aftermarket distributors worldwide.
• For full system optimization, we recommend pairing it with the Tritenco A-5000 Slave Valve Assembly and A-4740 Air Filter Regulator Assembly.

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Manufacturing Capability: Building the Tritenco K-3331 Splitter Valve

We are a professional manufacturer. We supply OE‑quality transmission pneumatic control valves. They match OE performance, fit, and specifications.

Our core products:

• A-5000 Slave Valve
• K-3331 Splitter Valve
• A-4740 Air Filter Regulator

These parts are direct replacements for Eaton Fuller heavy-duty transmissions, including the k3331 splitter valve.

We provide reliable aftermarket components. They perform consistently in tough commercial vehicle applications.

Our strengths cover the full product lifecycle:

• Process Engineering: Turn complex parts into efficient mass production.
• Process Optimization: Fix bottlenecks to meet strict industry standards.
• Stable Mass Production: Reliable, controlled production for consistent output.

We support high‑volume, stable supply for assembly lines and aftermarket distribution. This ensures continuity and cost efficiency.

 Learn more about our precision Manufacturing capability

Compatible Parts for the K-3331 Splitter Valve

• A-5000 Slave Valve
• A-4740 Air Filter Regulator