The pass-through kit (model 25974) can be used on the sides or back of flammable liquid safety cabinets. This unique system provides a means to dispense solvents with pressurized nitrogen through the wall of a cabinet, if a pressure nitrogen assist from an outside source is needed. It can also be used for vacuum or pressure venting containers inside the cabinet. The stainless-steel construction without a check valve allows flow in either direction. A 1/4 in NPT (tapered) fitting is required to thread into both sides of the pass-through. Only install on the sides and back of the safety cabinet, never on the doors, bottom or top of a cabinet. Factory installed-must be ordered with cabinet.