What are the different types of rubber pipe couplings available in the market and how do they compare in terms of durability and flexibility?

Rubber pipe couplings come in various types such as flexible, rigid, and transition couplings. Flexible couplings are more durable and allow for movement, while rigid couplings are sturdier but less flexible. Transition couplings are used to connect pipes of different materials. Overall, flexible couplings are often preferred for their balance of durability and flexibility.