The UIC | Air Inlet Valve NS 29/32 is the OEM air inlet valve for controlled venting of the UIC KDL5 molecular distillation system after a distillation run. The NS 29/32 ground glass fitting integrates directly into the UIC glass vacuum manifold, allowing gradual, controlled admittance of dry air or inert gas to safely return the system to atmospheric pressure. An OEM UIC replacement part for KDL5 distillation systems.