The spring/seal for the XLC Mono S/Duo S trailer hitch is an essential accessory for your child trailer. Manufactured by the renowned brand XLC, this rubber spring and seal allows you to securely attach your trailer to your bike. The carefully designed spring/seal ensures a safe and reliable connection for your trailer. Thanks to its rubber composition, it offers excellent shock and vibration resistance, providing a stable ride. Whether you are using the trailer in Mono S mode (for one trailer) or Duo S mode (for two trailers), this spring/thread coupling is compatible with both configurations. It can be easily adapted to all types of child trailers, regardless of their weight or size. Additionally, the installation of this spring/coupling connection is extremely simple. Just attach the spring and joint to the arm of your trailer and connect it to your bike's hitch. In just a few minutes, you will be ready for a safe ride with your family. Remember that the spring/joint of the XLC Mono S/Duo S trailer hitch is an important accessory for your child trailer. Don't take the risk of using a faulty attachment system; choose the quality and reliability of XLC instead. Order your spring/coupling now and fully enjoy your family bike outings.