Products T Piece (FRAS / FR) Diameters: 400mm – 1600mm Lengths: as agreed May also be spiraled as agreed. Y Piece (FRAS / FR) Diameters: 400mm – 1600mm Lengths: as agreed May also be spiraled as agreed. Reducers (FRAS / FR) Diameters: 400mm – 1600mm Lengths: as agreed May also be spiraled as agreed.