Bag on valve: 1.100% safe and protected 2.Long live aerosol. 3.Up to 100% product empty. 4.No need for flammable propellants Bag on valve Specifications: Name Bag on valve Other name Aerosol valve bag, Valve in bag Structure 1"Valve, Mounting Cup, Outer gasket, Inner gasket, Stem, Spring, Housing, Bag-on-valve connector, Aluminum foil pocket(4 layers). Material Tin, Aluminium, Nylon, PE etc. ...