Double pass-through for the controlled passage of materials between two distinct environments with different levels of contamination. The structure, without visible fasteners, includes removable parts for maintenance and internally adjustable feet for perfect stability. The double manual interlocking system allows for alternating opening via red/green LED buttons, ensuring safety and the correct operating sequence. Optional X-ray protection with 1, 2, or 3 mm lead is available for use in radiation-protected environments.