Reservoir Tank by Kawasaki

Kawasaki UTV/ATV & Side by Side Cooling Tanks & Components - Available at buywitchdoctors.com

Product Specifications: Genuine OEM Kawasaki Reservoir Tank, Part # 43078-0621.

Keep your machine running like new with a genuine Kawasaki Cooling Tanks & Components paired with premium maintenance parts from buywitchdoctors.com.

When you are out tearing up the trails or working hard on the job site, your thermal management configuration demands absolute pressure containment and precise expansion volume tracking to perform at its peak. This factory-original overflow bottle assembly is designed specifically for your vehicle, ensuring a perfect airtight cap seal and precise volume management that aftermarket options simply cannot guarantee.

Why Choose a Genuine Kawasaki OEM Cooling Tanks & Components?

Your Kawasaki engine cooling loop is a highly integrated, pressurized environment. Off-brand universal recovery tanks or generic expansion bottles often use thinner composite plastics that turn brittle under extreme heat, split open along molded seams, or utilize poorly toleranced neck paths that leak fluid. By choosing an original equipment manufacturer (OEM) replacement tank or structural reservoir cap, you protect your investment, maintain your factory warranty, and ensure heavy-duty chemical resistance, high burst structural limits, and total fluid protection.

Premium Materials and Engine Protection

• High-Density Media: Advanced high-density polyethylene structures engineered to handle extreme thermal fluid spikes and withstand direct impacts from flying trail debris without cracking.
• Exact Fit Polyurethane Seals: Features factory-matched mounting dimensions and exact-thread cap neck pathways to prevent vacuum loss and fluid weeping under system pressures.
• Heavy-Duty Construction: Molded with high-visibility fill lines to allow immediate, effortless coolant fluid tracking during pre-ride maintenance safety inspections.
• Maximum Airflow Efficiency: Engineered precisely to align with your vehicle's factory brackets, fitting flush inside the engine bay without rubbing or vibrating against hot chassis surfaces.

Comprehensive Model Fitment (2015-Current)

This genuine OEM part is engineered for a wide range of Kawasaki side-by-side (SxS) and all-terrain vehicles (ATV) built from 2015 to the current model year. Please verify your series matches below:

Utility Task Vehicles (UTVs / Side-by-Sides)

• Mule Series: SX, 4000, 4010, PRO-MX, PRO-FX, PRO FXT, PRO-DX, PRO DXT, PRO FXR
• Teryx & Teryx4 Series: KRX 1000, KRX4 1000, H2, Teryx5 H2
• Ridge & Ridge XR Series:

All-Terrain Vehicles (ATVs)

• KFX Series: 50, 90
• Brute Force Series: 300, 450, 750 4x4i

⚠️ IMPORTANT DISCLAIMER: Always check your owner’s manual or the fitment tab on witchdoctors.com to make sure this part fits your specific year, make, and model before ordering.

Other Popular Parts and Accessories

• Coolant Fans & Components: High-output waterproof electric fan shrouds, blades, and temperature relay switches built to force air through cores during slow trail crawling.
• Coolant: High-performance pre-diluted engine coolant fluid chemically formulated to lubricate water pumps and prevent internal aluminum oxidation.
• Radiator Hose / Line: Heavy-duty molded EPDM rubber fluid transfer hoses reinforced with high-tensile inner fiber braid networks to manage high pressure lines.
• Radiators & Components: Premium factory replacement radiator cores, high-pressure caps, and heavy-duty mud guards engineered to maximize cooling block efficiencies.

Frequently Asked Questions (FAQs)

What causes a Kawasaki UTV/ATV coolant expansion tank to boil over or bubble rapidly?
Extreme bubbling inside your cooling tank typically means air pockets are expansion-cycling in the system, your radiator core is blocked with trail mud fin debris, or your radiator pressure cap spring has weakened. When a cap can no longer hold standard loop pressure, fluid escapes prematurely into the overflow reservoir, causing a boil over.

Should I clean or flush out my reservoir bottle if it looks dark or slimy inside?
Yes, absolutely. If you notice a milky brown color, a dark "chocolate milk" texture, or fine grit settling at the base of your cooling tank, it reveals internal system degradation or a contaminated mixture. Draining, flushing, and replacing the bottle along with fresh fluid prevents abrasive sludge from flowing back into your water pump assemblies.

PRO TIP: Learn More about Kawasaki OEM vs. Aftermarket Parts

PRO TIP: UTV/ATV Cooling Issues Explained.

PRO TIP: Why Is My Coolant Tank Bubbling, Boiling Over, or Spitting Out Fluid?

Upgrade Your Ride's Protection Today

Don't let a brittle overflow bottle, cracked expansion cap, or leaking reservoir connection siphon away your coolant loop pressures and overheat your motor out on the trails. Keep your cooling infrastructure running strong with maximum factory durability on every single venture. Order your genuine Kawasaki UTV/ATV OEM Cooling Tanks & Components today from Witchdoctors.com and enjoy fast shipping straight to your door!

Are You Looking to Find Great Places & Adventurous Trails to Ride Your UTV, Side by Side or ATV? Check out these highly recommended places:

• Mines & Meadows
• Mountain Ridge ATV Park
• Busco Beach ATV/ UTV Park
• Indian Mountain ATV/UTV Park
• Wildcat Offroad Park