Our company since its inception, always regards product quality as enterprise life, continuously improve production technology, improve product quality and continuously strengthen enterprise total quality management, in strict accordance with the national standard ISO 9001:2000 for Astm A888 All Inch Black Cast Iron Pipe, 500x500 Drain Cover, Lockable Manhole Cover, Manhole Cover Frame,Metal Man Hole Cover. Welcome any of your inquiries and concerns for our products, we look forward to establishing a long-term business relationship with you in the near future. contact us today. The product will supply to all over the world, such as Europe, America, Australia,Indonesia, Maldives,luzern, Paraguay.we sincerely hope to establish a good and long-term business relationship with your esteemed company through this opportunity, based on equality, mutual benefit and win-win business from now to the future. "Your satisfaction is our happiness".