One thing to remember when using a locking gasket is that you only get one shot on assembly, and they are extremely difficult to disassemble once assembled, even when using a shim kit to deactivate the wedges within the gasket. Primarily used for buried applications, restraint gaskets are not recommended for above-ground applications, bridges, or vertical applications. Restraint gaskets are an excellent option and are primarily used in smaller diameters (24 inches and down). Pulling back on the joint will “lock” the teeth in place. The restraint is engaged after the joint has been properly assembled, including deflection. Some locking gaskets are developed without the pipe manufacturers' written consent and may not work correctly on the pipe. Before using locking gaskets from a supplier other than a DI pipe manufacturer, ensure they are approved for use with their pipe. There are currently other manufacturers developing locking gaskets. Locking gaskets are also unique to each manufacturer. Locking Gaskets are used on push-on pipe to restrain the pipe. You cannot go wrong with the use of this type of restraint joint.
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