Concrete pipe mold fall into two types according to the way of connection of the shaped drain pipes: rigid joint and flexible joint; pipe mold fall into three types according to the joint shape of shaped drain pipes: plain top, tongue and groove, bell and spigot; pipe mold fall into Ⅰ, Ⅱ, Ⅲ grades according the grade difference of external pressure load of shaped drain pipes. ,Easy to customize for you follow your detail drawings,normal diemater D300-D3600mm(pipe inner diameter ),length :1-4.5M.