2x Flat Bend: Change direction by 90 degrees on flat surfaces 2x Internal Bend: Join lengths around 90 degree inside corners 2x External Bend: Join lengths around 90 degree outside corners 2x Equal Tee: Use to join 3 lengths of same profile 3x Coupler: Join 2 lengths of same profile on flat surface 2x End Cap: Neatly finish open ends

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