JOINTING Of uPVC PIPES: There are mainly two types of joints  Rubber  ring  socket  and coupling    joint  and   the   other one is Solvent weld socket type. Please   click   on  the  link  for  more  details  including  the procedure for jointing. A few essentials must always be remembered while jointing. Spigot and sealing ring must be well lubricated The pipes must be properly aligned Use of excessive force while jointing can damage the pipes permanently. The spigot should be inserted only up to the depth insertion mark.