Barrier (1) for being installed at least partly within a sewage pipe, wherein said barrier (1) comprises two support wings (4) forming an outer shell of said barrier, one or more shutters (6), at least one shutter guide mechanism (7), and a mounting tube (8), and wherein said barrier (1) having a pipe shaped outer shell installable in the sewage pipe, and said barrier having a longitudinal axis X along said pipe shaped outer shell, wherein said shutter (6) is partly covered by said support wings (4), and wherein said support wings (4) are placed along the longitudinal axis X, wherein said support wings (4) are adapted to pivot about a wing hinge (10) positioned on a frame housing (9) of said barrier, wherein said barrier is adapted for having said shutter (6) capable of pivoting about a shutter hinge (15) provided in said frame housing (9) of said barrier, where said shutter (6) having a closed position and a more or less open position, where the shutter (6) is capable of pivoting from a substantially vertical closed position to an angular open position away from vertical in one direction along the longitudinal axis X, where said shutter guide mechanism (7) is capable of controlling said shutter movement direction from a first direction to a second direction opposite to the first direction, along the longitudinal axis X, and furthermore said shutter guide mechanism is capable of adjusting a shutter kip angle a, where shutter kip angle a is the angle from the shutters vertical closing position to maximum angular opening position, and said shutter guide mechanism (7) being capable of preventing the shutter to move in the respective opposite direction to the first or second direction along the longitudinal axis X.
