Features:1) Drainage system comprises socketless centrifugal cast iron pipes, socketless fittings,joints (couplings or clamping components) and accessories2) As a reliable and inexpensive drainage system, it is an ideal choice for buildingdrainage system because it is solid and durable with excellent noise suppression,fire resistance, low thermal expansion and chemical resistance3) It facilitates to install4) Black bitumen producing area:China