Air Valve Body: ductile iron. 
Standard: DIN 3352/BS 5163/AWWA. 
Pressure: 150 to 2,500LB. 
Resilient gate valve PN10, PN16, PN25. 
Body/bonnet: cast iron/ductile iron. 
Wedge: cast iron/ductile iron with EPDM. 
Stem: stainless steel. 
Coating: epoxy painted with 200 microns.