Car spray valve: 1.Longer shelf time. 2.Near 100% emptying. 3 ... 4.Less noise when spraying. NameBag on valveOther nameAerosol valve bag, Valve in bagStructure1"Valve, Mounting Cup, Outer gasket, Inner gasket, Stem ... , Spring, Housing, Bag-on-valve connector, Aluminum foil pocket(4 layers).MaterialTin, Aluminium, Nylon, ... noise when sprayingCETISO 9001:2000 Car spray valve