Pipe - Ductile Iron Restrained Joint
Restrained Joint Ductile Iron Pipe is a special type of ductile iron pipe used when the pipe must be pulled into position or for critical earthquake prone areas. The joints are different than the usual mechanical joints or restrained mechanical joints.
The pipe is sold under different brand names such as TR Flex, Fast-Tite, Field-Flex. Flex Ring, Lock Ring, TR Flex and others.