1. It is designed with a small hole through which you can insert a ruler into the wiper fluid reservoir. 2. It is made of sturdy plastic, which is durable and long - lasting. You don't have to worry about it breaking easily. 3. This wiper fluid reservoir cap can prevent the water in the reservoir from overflowing. 4. It is a good replacement for models such as 106/206/207/307, C2/C - Elysee/Xsara. You can use it to replace a worn or damaged cap. 5. The surface of the cap is designed with a pattern to indicate the purpose of the bottle. 6. Compatible models: Can replace the caps of 106/206/207/307 models; Can replace the caps of C2/C - Elysee/Xsara models. 7. Material: Plastic. 8. Color: Blue. 9. Package contents: 5 wiper fluid reservoir caps. 10. Only the above - mentioned package contents are included, and other items are not included. 11. Note: Light and different displays may cause the color of the item to vary slightly from the actual product. The allowable measurement error is +/- 1 - 3 cm.