... Assembly(armature/stem/valve core) Item No.: ALT227 Specifications: 1, 3/2 Normal Close 2, tube and base material is stainless ... steel 3,plunger and tube head material is magnetic material 4,the ... us ,we also can produce the product as your requirements. 3/2 NC 16mm Diameter Stainless Steel Pneumatic Solenoid Valve Controller