• Do you have UL /FM Certificates for fire sprinkler steel pipes?
• : How long does your warranty?
• What do your factory do regarding quality control?
• :Where is your factory located? How can I visit there?
• Can I have a trial order only for several tons carbon steel pipe?
• Are you gold supplier and do trade assurance?
• Does your factory have your own brand name?
• How long does it take shipment by sea ?
• What is your terms of payment?
• How long is your delivery time for natural black carbon steel pipe?
• Do you provide steel pipe samples ? is it free or extra ?
• Is Youfa a trading company or manufacture?
• How To Protect Black Pipe ?
• Can You Delivery Welded Steel Pipe To Middle Asia?