Car Water Tank Cap 

Fits most vehicles with dimensions described 

For Peugeot 106 205 206 207 306 307 406, Citroen C4 C2/C-Elysee Picasso Saxo Xantia Xsara Washer Radiator Cover, Mazda, Nissan, Toyota, Honda, etc

And other makes and models as per dimensions

Appx 15cm x 5.3cm