aoshan.co/Flexible%20Coupling%20&%20No%20Hub%20Coupling%20Catalog.pdfPacking: 50pc/Carton Port of Loading: Xingang, China Richang Qiaoshan Trade Co., Ltd. manufacture Cast Iron Soil Pipes, Fittings, No Hub Couplings, Flexible Rubber Coupling, Heavy Duty Couplings, Cast Iron Roof Drain, Cast Iron Floor Drain, Cast Iron Closet Flange and Downspout Nozzle and Flange since 1996.