... 5. Surface: Yellow brass color, or Nickel plated, or Chrome plated.6. Certification: ISO9001:2000.7. 10 years OEM ... Changshan Hongfeng Tubing Co., Ltd. (HT for short), established in 2003, is a professional manufacturer of various brass fittings. ... applications, our products are mainly used in: water pipes, air conditioner, refrigerator, fire valve, gardening, high-level hygienic equipment and ...