BAWER pass-throughs are designed for the service of transferring materials between two environments with different degrees of contamination. The structure has no visible fasteners, has removable parts for maintenance, and the feet are adjustable from the inside. The interlocking system allows opening, which is done manually by acting on the red/green LED backlit buttons (to communicate system consent/change). Optionally, it is possible to equip the device with anti-RX protection (1, 2 and 3mm lead).