Innovative Rubber Solutions Since 1944




Supporting the advancement of automotive technology for gasoline, disel and hybrid powered engines.

Automakers in Japan and overseas have a long history of relying on Kokoku’s diverse range of automotive components.

Kokoku has always responded swiftly to changing times and the challenges they bring. As the need to protect our environment becomes more and more urgent, Kokoku is once again
playing an active role.

Kokoku has already had great success in developing eco-friendly materials and components.
Our efforts will continue to contribute to the realization of cleaner, more efficient automotive technologies.



Gasoline Engine Components:
・Gasket: Head Cover, Intake Manifold, Throttle Body, Oil Filter & Water Pump, etc.
・Diaphragm: Variable Intake, Canister, OPS, PCV, ASV, & Fuel Cut Valve, etc.
・Hose: Fuel, Purge, Blow-by, Oil, LLC & Air Breather, etc.

Hybrid vehicle components:
・Pressure Relief Valve/Plug for rechargeable batteries.
・Electric Water Pump
・Gas Tank Valve, etc..

Fuel cell vehicle components:
・Stack seal
・Humidifier seal
・Hose, etc…

Diesel engine components:
・Full floating head cover system
・Inter-cooler hose
・Standing wave rubber
・Hybrid molded diaphragm for injector pump.

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