Flow couplings are thick-walled tubular components normally utilized in completions and located adjacent to changes in the tubing ID. They are an important part of life-of-the-well completion planning and used where erosional turbulence caused by changes in the tubing ID. Petrostar recommends flow couplings to be installed above and below landing nipples, safety valve landing nipples or any other restrictions that may cause turbulent flow. Flow couplings are generally connection OD and are available in 3, 4, 6 and 8 ft lengths.