Avon C50 First Responder Kit Small: AV-70501-557. Brand new and never used! It’s been sitting in my closet and needs a new home as it’s not going to get used. Kit Includes visor inserts, storage bags, plugs, instructions, everything seen in the pics! AV-90662 – Protective APR Adapter, CamelbaK Type A: Qty 2. AV-70501-168 – C50 Filter Mount Gasket: Qty 10. AV-70501-169 – Inlet / Oulet Disk Valve: Qty 10.