12-inch – 20-inch pipes have 2 slots in the bell and require 2 sets of locking segments (2 LH & 2 RH).Note: On above sizes, the second slot would only be used in the case of field cut pipe application.
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Pro Tip: On these sizes, position one of the slots to make it easily accessible. 4-inch – 10-inch pipes have 2 slots in the bell and require 1 set of locking segments (1 LH & 1 RH).The locking segments are sized specific to the pipe diameter being installed and the number required is also based on the pipe size as noted below: McWane Ductile manufactures TR Flex® pipe and fittings in sizes 4-inch through 36-inch. Once assembled, this positive restraint prevents the joint from separating under extreme operating conditions. TR Flex® utilizes locking segments that fit into a bell slot that wedge against a welded bead applied to the spigot end of the connecting pipe. Areas where you may encounter unstable soil conditions.Restraining joints on either side of a fitting per design requirements.
TR Flex® utilizes the Tyton® joint gasket for a watertight seal along with a factory adapted spigot and extended bell casting to provide positive and permanent joint restraint. Proven as a versatile and easy-to-use item, this joint is flexible, sure, and watertight to and beyond it’s up-to-350-psi pressure rating while preventing longitudinal separation of the joints whether installed above or below ground. TR Flex® is the most-widely accepted and installed integrally-cast restraint joint system in the ductile iron pipe industry.