Inversion unit with window

An inversion unit comprising:

• a housing,
• a reel for a liner partially arranged in the housing, and
• a base assembly, the housing being arranged on the base assembly, wherein:
• said housing comprises:
• a gas inlet,
• an outlet for the liner,
• an opening comprising a window, and
• a bayonet catch for closing and opening the window, said bayonet catch configured to be maneuvered into an open position in which the window is open and unlocked and a closed position in which the window is closed and locked,
• the bayonet catch comprises:
• a motion link assembly,
• a projection assembly configured to engage with the motion link assembly,
• a handle, and
• a hinge, wherein:
• the handle is pivotably connected to the hinge,
• one of the motion link assembly or the projection assembly is arranged on the window and the other of the projection assembly or the motion link assembly is arranged on an edge of the opening,
• the hinge is arranged on the housing,
• the handle is pivotably connected to the window so that the window can be opened and closed in a bayonet catch manner using the handle, and
• the motion link assembly comprises guides oriented so that the window slides in a linear motion relative to the housing when the handle is operated.