Abstract: A cooling manifold assembly for cooling combustion turbine components is provided. The manifold assembly comprises at least a first and second connector box. Each one of the first and second two connector boxes comprises a housing. A fluid supply conduit and return conduit are securely coupled with the housing. The fluid supply conduit is adapted to be in fluid communication with a cooling fluid for cooling a hot turbine part. The return conduit is adapted to be in fluid communication with a cooling fluid that has extracted heat from a turbine hot part. A cooling fluid supply pipe for supplying a cooling fluid to the first and second connector boxes is provided. The supply pipe comprises a side wall that defines a coolant flow channel with a first opening at a first end, and a second opening at a second end. The first end of the fluid supply pipe is mechanically coupled in fluid communication with the fluid supply conduit of the first connector box.