... : carbon steel, stainless steel, brass9. Airproof/ Seal: NBR, FPM10. Surface Disposal: Blank-phosphoric polish (black), G-electroplated yellow zinc (yellow), G-electroplated yellow ... typethread,flange,manifold,mountingCertificateISO9001:2000StandardAmeican ,Japan,Greman,Chinese,BritishSurface disposalBlank-phosphoric polish (black), G-electroplated yellow zinc (yellow), G-electroplated yellow ...