024-T3 aluminum riveted to the aircraft structure. Each desiccant tube is plumbed to each window with 5052-0 0.25" tubing, Tygon polyethylene tube, Nalgene nylon TEE P/N: 582707C/15221CA and Y P/N: 582747C/13366CA fittings as required. Performed an oxygen drop-out test in accordance with Gulfstream Aero