How to distinguish flexible and rigid interfaces between cast iron pipe joints
Flexible connections can be kept watertight at any angle (lateral or vertical), and rigid, where the interface of a pipe is easy to crack if a slight earthquake is encountered
Rigidity is a way of connection that has been eliminated. Sealing is achieved by pouring cement into the spigot
Flexible connection is divided into A type, B type, W type, A, B type for flange connection, by flange, bolt and rubber ring to achieve sealed connection, W type is clamp connection, clamp what looks like, ha ha not say more
