OEM-Style Fuel Filler Inner Tube for JET S 125

．Applicable models: SYM JET S / New Fighter 125 R
．Color: Red
．Applicable grip length: 120mm

．Product Manual

※ No cutting or modification required during installation.

- Origin -
KOSO was officially established due to the realization that an independently developed brand is indispensable for future market marketing. Therefore, KOSO was registered as a trademark of Tong Ya in 1989. The name KOSO is derived from the Japanese words for "conception" and "high speed"; conception represents creativity, while high speed represents high-performance expression—combined, it reflects the company's desire to use creativity to create high-performance products!

- Spirit -
The brand spirit pursued by KOSO is to build quality, technology, and service on the foundation of integrity and mutual trust. We persistently uphold this attitude, not only manufacturing high-quality products but also pursuing product innovation and quality improvement, hoping to bring even more excellent products to everyone.



- Brand Journey -
Pursuing perfect product design and quality has always been our goal. Therefore, KOSO constantly spurs itself on by improving its own technology. We firmly believe that brand image and product quality are synonymous! Therefore, the company has strict requirements for product development, production processes, and quality control, hoping to achieve the goal of high quality while stepping onto the world stage. In the future, KOSO will continue to develop more user-friendly and innovative products, and hopes to become the next world number one from Taiwan within ten years, another pride of Taiwan, and the pride of the Taiwanese people.

- Exhibitions and Certifications -
Tong Ya Electronic has been exhibiting in Italy since 2001, gradually stepping onto the international stage, bringing KOSO's dedication and professionalism to the world, and striving to convey an image of high quality and innovation. It obtained TS16949 international certification in 2007, and ISO 14001 and ISO 45001 international certifications in 2024, and will continue to create more compelling products in the future. Every product launch requires actual installation testing, which is the strictest quality inspection method. No matter how well a product is designed, once it is actually installed and used, it is a test of quality. In order to further improve quality and conduct actual product testing, we participate in international competitions. However, every award is an affirmation of the product, because it is a modification and installation that does not allow for errors. We are so rigorous about quality. Test reports and product measurement charts are also our demonstration of the results of customer installation. It is precisely because of this caution that our products can show better quality time after time.




- Equipment and Checkpoints -
The pre-inspection of each of our products uses the most advanced technical machinery, setting different conditions to simulate and conduct tests, such as vibration tests, waterproof tests, etc. All entrusted partner manufacturers who have participated in the inspection process agree with our principles of quality control and trust the test results. What is rare is that under the test of the product like passing levels, we also add different conditions and make adjustments based on the actual environment, and cooperate with user-friendly operations to present the most realistic test of the product and the quality improved after correction.

※The vehicle model may have different specifications in different regions and may not be compatible for installation.

[Notes before ordering]
Before ordering, please double-check the color, size, and other information you wish to purchase.
Most products have delivery times provided after the order is placed, so there may be situations where products are discontinued or require a long wait for shipment.
If an order cannot be fulfilled due to factors such as manufacturer stock shortages or temporary inability to deliver, it will not be processed; no fees will be charged if the order is not processed.
Please be aware that manufacturers may unilaterally change specifications or exterior designs, which may result in the packaging or the product itself looking different from the images on the product page.
If a product cannot perform the functions expected at the time of ordering due to a unilateral change in product design or specifications by the manufacturer, please consult our customer service for follow-up processing.
Products go through multiple shipping processes from order to delivery, so packaging may be deformed or damaged during transport, but the product itself remains intact and usable.
[Return Policy]
If you need to return a product, please apply in the return section; please keep the product appearance intact and seal it in the original packaging box.
Upon receiving your return request, we will dispatch a logistics provider to collect the item as soon as possible.
For returns due to non-human-induced defects, please apply within 7 days of receiving the product.
[Authenticity Guarantee]
For products with an authenticity guarantee, if they are found to be suspected counterfeits and are confirmed as such by a court judgment after relevant litigation, we will compensate the customer who purchased the product 10 times the original purchase price.