The rubber ring used in our products is made of EPDM (Ethylene Propylene Diene Monomer) rubber. EPDM rubber is a durable and reliable material known for its excellent resistance to weathering, UV exposure, ozone, and a wide range of chemicals. It is commonly used in various applications due to its high elasticity, thermal stability, and resistance to degradation. The EPDM rubber rings used in our products ensure a secure and watertight connection, providing long-lasting performance and reliability in the intended applications.