There is a section of the pikchain®, where cables and hoses coming from the energy chain must be diverted to the inner of the conveyor chain. As long as the cables and hoses have no big outer diameters everything is ok, and to prevent additional wear between the cables and hoses you can add protection hoses. See picture.
But in the case that you have really thick pneumatic hoses you will have a problem diverting the hoses from the energy chain to the conveyor chain because of the acceptable bending radius. It will be too big for the chain.
Specifically for this problem igus® have created a special link. This link consists of a channel, through which the air finds its way from one hose to the other (marked red). Result: No bending radius, no wear, no additional and the lifetime goes up.