Allegro Industries 9901 Constant Flow Supplied Air Respirator, Full Face, Standard Lens: High impact polycarbonate (meets ANSI Z871) Suspension: Non-slip durable rubber five point harness Seal: Hypoallergenic and chemical/ozone resistant Down Tube & Belt Assembly: 90 elbow allows it to be directed over the shoulder and out of the way NIOSH Approval: Approval No TC-19C-353 (Use only Allegro approved airline hose)