Black rubber gasket with a round, slightly domed shape and a flat outer edge.
Black round rubber gasket with a raised dome center and flat outer edge for reservoir tank cap.
Black round rubber gasket with a raised dome center and flat base edge.
Small black rubber gasket with a round, slightly concave shape and raised edge.
Gasket,Reservoir Tank Cap by Kawasaki 11009-1145 OEM Hardware 11009-1145 Off Road Express Peach St
An Image of the Genuine Kawasaki Logo reading 'GENUINE OEM PART' 11009-1145
Four Kawasaki off-road vehicles displayed with the Kawasaki logo above them on a white background.
An infographic titled 'BLOCKED COOLING LOOP' with four numbered common signs and symptoms: rapid overheating, boiling and gargling, stuck radiator fan, and coolant spewing. It includes labeled illustrations of an ATV/UTV engine cooling system, a temperature gauge, a radiator, and a fan, with explanatory text and a green footer note.
Infographic explaining hot upper hose and cold lower hose coolant flow in a UTV/ATV, with a vehicle diagram, red and blue coolant lines, labeled parts like thermostat, water pump, radiator, and engine, plus a common causes section with numbered callouts.
Black rubber gasket with a round, slightly domed shape and a flat outer edge.
Black round rubber gasket with a raised dome center and flat outer edge for reservoir tank cap.
Black round rubber gasket with a raised dome center and flat base edge.
Small black rubber gasket with a round, slightly concave shape and raised edge.
Gasket,Reservoir Tank Cap by Kawasaki 11009-1145 OEM Hardware 11009-1145 Off Road Express Peach St
An Image of the Genuine Kawasaki Logo reading 'GENUINE OEM PART' 11009-1145
Four Kawasaki off-road vehicles displayed with the Kawasaki logo above them on a white background.
An infographic titled 'BLOCKED COOLING LOOP' with four numbered common signs and symptoms: rapid overheating, boiling and gargling, stuck radiator fan, and coolant spewing. It includes labeled illustrations of an ATV/UTV engine cooling system, a temperature gauge, a radiator, and a fan, with explanatory text and a green footer note.
Infographic explaining hot upper hose and cold lower hose coolant flow in a UTV/ATV, with a vehicle diagram, red and blue coolant lines, labeled parts like thermostat, water pump, radiator, and engine, plus a common causes section with numbered callouts.
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Reservoir Tank Cap Gasket by Kawasaki

$1.42 USD
Normally Ships in 8-12 Business Days

Inventory:

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SKU: 11009-1145
In stock and ready for shipping

SKU: 11009-1145

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

Product Specifications: Genuine OEM Kawasaki Reservoir Tank Cap Gasket, Part # 11009-1145.

Keep your machine running like new with a genuine Kawasaki Radiators & 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 cooling system demands absolute thermal heat exchange and heavy-duty structural durability to perform at its peak. This factory-original cooling core assembly is designed specifically for your vehicle, ensuring a perfect drop-in frame fitment and superior fluid temperature management that aftermarket options simply cannot guarantee.

Why Choose a Genuine Kawasaki OEM Radiators & Components?

Your Kawasaki engine depends on a continuous cycle of cool fluid to prevent catastrophic warping, head gasket failure, and terminal motor failure. Off-brand universal radiators often feature lower-grade aluminum alloys, thinner core depths, or imprecise tank welds that can split apart under heavy trail vibration or plug up rapidly with fine mud roost. By choosing an original equipment manufacturer (OEM) replacement radiator or structural component, you protect your investment, maintain your factory warranty, and ensure rugged brazed-seam reliability, highly efficient cooling louver counts, and maximum engine longevity.

Premium Materials and Engine Protection

  • High-Density Media: Advanced high-grade lightweight aluminum core and brazed end-tanks engineered to maximize surface area contact and sweep away heat under high loads.
  • Exact Fit Polyurethane Seals: Features factory-matched mounting tabs and rubber isolation grommet recesses that align perfectly flush with your chassis frames to eliminate metal fatigue.
  • Heavy-Duty Construction: Built to endure continuous extreme coolant pressures, corrosive chemical breakdown, and the rugged, mud-packed environments your vehicle encounters.
  • Maximum Airflow Efficiency: Engineered precisely with optimized fin pitch and spacing configurations to allow heavy cooling wind through the core without collecting restrictive trail debris.

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)

All-Terrain Vehicles (ATVs)

⚠️ 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

  • Cooling Fans & Components: High-output waterproof electric fan shrouds, blades, and temperature relay switches built to force air through cores during slow trail crawling.
  • Coolant Tanks & Components: Premium factory replacement coolant expansion recovery bottles, specialized high-pressure caps, and heavy-duty structural mounts.
  • 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.

Frequently Asked Questions (FAQs)

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

What are the signs that my Kawasaki radiator core is failing or needs to be replaced?
Common indicators include a vehicle that constantly runs hot or overheats during moderate work, fine streams of steam spraying from the engine bay, visible pinhole leaks or green fluid crusting along the aluminum fins, or crushed cooling tubes from flying trail gravel. A radiator that feels cold at the bottom while the engine is scaling hot also reveals internal flow clogging.

Should I flush my engine cooling system before installing this brand new radiator?
Yes, a thorough cooling circuit flush is highly mandatory. When an old radiator fails or gets clogged, metallic scale, rust particles, and old degraded coolant gel settle deep within your engine block and heater passages. Flushing out the residual system with clean distilled fluid ensures your brand-new factory core doesn't immediately trap recirculated debris.

PRO TIP: Signs of a Bad UTV Water Pump: How to Diagnose, Test, and Replace

PRO TIP: Signs Your UTV or ATV Thermostat is Bad (And How to Test It

PRO TIP: Learn How to Test Your UTV, Motorcycle or ATV Coolant.

Upgrade Your Ride's Protection Today

Don't let a ruptured end-tank, bent core tubing, or clogged internal cooling paths cook your cylinder heads and leave you with a massive repair bill on the trail. Keep your thermal core operating with premium mechanical assurance on every trip. Order your genuine Kawasaki UTV/ATV OEM Radiators & 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:

General Safety Warning & Installation Requirements

Your safety is our top priority. Whether you are maintaining a Victory® or Indian® Motorcycle, or servicing a UTV, ATV, or Side-by-Side, proper installation is vital to the performance and safety of your vehicle.

Important:
Warning: Failure to follow manufacturer-specified installation procedures and safety requirements can result in mechanical failure, loss of vehicle control, serious injury, or death.

Important Fitment Disclosure

At Witchdoctors, we want to ensure you get back on the road or trail as quickly as possible. Correct fitment is the most critical step in purchasing parts for your Victory® or Indian® Motorcycle. Also for your Polaris®, CFMoto®, Arctic Cat®, Yamaha®, Honda®, Can-Am®, Kawasaki® UTV and ATV.

Verification Required: While we strive for 100% accuracy, vehicle manufacturers often make mid-year production changes. Always verify your specific year, make, and model before finalizing your order.
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Shipping

Qualifying Retail orders $159.99 or more will receive free ground shipping. Free Shipping Terms and conditions.

All orders over $500 will require a signature.

Please see International Shipping page for orders shipping outside the US.

See our full Shipping Policy page for further details.

Product Availability

We show real time product availability. These products normally ship the same business day but may ship from one of our warehouses across the country. If an item requires additional processing time you will be notified.

Returns

If your order arrives and it is not right, we will we'll fix it. We promise!

Doesn't fit or just not happy with it? You can return any new, unopened, unused or unaltered item within 30 business days of delivery receipt of your item. We will issue a refund to your original payment method.

See our full Return Policy for all of the pertinent details.

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