round rubber gaskets seals  

https://www.chinarubberseals.com/products/nbrround-flat-rubber-gasket-259072.html

A round rubber gaskets seals is a type of gasket that is made of rubber and is designed to seal a joint between two surfaces. It is typically round in shape and flat, with a uniform thickness across its surface. The gasket is placed between two surfaces to create a seal and prevent leaks. They are commonly used in plumbing, automotive and industrial applications.

Round flat rubber gaskets are a popular choice for many industrial and automotive applications due to their durability and flexibility. They are a cost-effective solution for preventing leaks and can be customized to fit specific applications. They are simple and easy to install, making them a reliable and efficient sealing solution.