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Air Intake Systems are designed to supply particle-free and dust-free air to a vehicle's engine. At the same time, the Air Intake System plays in an important role in reducing and modifying the ambient noise coming from the engine.

Intake Manifolds (or, Inmani in Japanese-English) are designed to channel air or air/fuel mixtures into each cylinder in a vehicle's engine.
The design of an Intake Manifold is based on creating channels, or pipes, leading to the cylinders. The Intake Manifold also includes a chamber, which is designed to reduce the amount of noise created by the intake of air. Also, the amount of air is controlled carefully by the funnels to direct the ideal air/fuel mixture into the cylinder and ensure optimal engine output.
At ROKI Co., Ltd., we are able to design a superior and highly efficient Intake Manifold while adhering to the layout space provided by the car-maker.

These products filter dirt or abrasive particles from the power steering fluid. These Power Steering Fluid Filters must also ensure that no air enters the system, as well as carefully control the amount of power steering fluid passing through the system.

ROKI Co., Ltd. has earned the trust of many OEMs for our expertise in regards to Power Steering Fluid Filters.

For multi-purpose or generator engines, to which it is normally difficult to attach extra parts, we have developed a carbon canister which combines with the fuel cap. This type of product is manufactured by only a few companies worldwide.

Carbon Canisters are an important part of the automotive parts industry's efforts to sustain the environment; these canisters prevent harmful gasoline vapors from escaping from the fuel system.

The Carbon Canisters developed by ROKI Co., Ltd. have earned a reputation worldwide for satisfying even the strictest environmental regulations.

A Carbon Canister contains activated carbon and padding.

The Automatic Transmission Fluid Strainer's primary role is of course to strain and filter the automatic transmission fluid. In recent years, because of the increased focus on amenities and fuel economy and as well as because of the need for high levels of accuracy due to electronic oil pressure systems, the importance of this component has increased significantly.
Since ROKI Co., Ltd. has created its own proprietary filter paper and mechanism, we are able to develop high efficiency, low pressure Strainers which can fit in small spaces.

Variable-height filters The technology to alter the height of the filter pleats, allowing increased surface area in a smaller space.

Engine oil is as vital to a vehicle's engine as blood is to a human body; engine oil ensures that all the vital engine parts will continue to function properly.
At ROKI Co., Ltd. we constantly strive to develop advanced, efficient oil filtration systems which also take the environment into consideration.

These filters remove the contaminants and particles in gasoline, which in turn reduces the strain on the carburetor and other engine parts.
Fuel filters have the longest R & D history of all ROKI Co., Ltd. products.