The fitting wrench with moveable jaw (20-50) have used to open and to close all kinds of polyethylene screw fitting such as knee, 3-ways,3-ways conversion, flanged fitting, interface and end cap in epicene type.
All you have to do is insert a special tab in the threads are embedded on the fitting and tighten the nut very easily. The moveable jaw wrenches can be used for 20 to 50 mm fitting
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