Material: HT150( Gray cast iron) Making process: centrifugal casting process Standard: GB/ T12772, ISO6594, ASTM A888/ CISP130, BS EN877, KSD4307, And DIN19522 Specification: Inside diameter from $ 8mm to 250mm( 1.5â 10â ) with 3m length Function characteristics: The cast iron soil pipe or cast iron sewage pipe is produced by centrifugal casting process. The centrifugal cast iron soil pipe and cast iron pipe fittings are flexibly connected through stainless steel couplings with high quality rubber sealing gasket inside it.