The PB pass-throughs manufactured by PHAMM are made of TIG-welded AISI 304 satin-finish stainless steel monoblock. The doors are interlocked to prevent the simultaneous opening of the two doors and the status is visible through appropriate visual indicators. The inner part of the PB is rounded at all corners to prevent dust accumulation, and the surface is polished to increase the degree of internal cleanliness. All joints are welded and brushed to avoid protrusions. PHAMM's great production flexibility make possible to create non-standard models according to customer specifications.