These tensioners have an overload safety feature and two connections. Because of this only 1 t-piece per assembly is required. To date this is the best way to tighten flange connections. By using this method the bolts are ‘pulled’ to the required value, resulting in an even force on all sides of the flange, assuring that the flanges are equally pulled to one another. We have a range of tensioners from ¾” to 4” bolt size.