My company is a manufacturer under Hangzhou Zuihong Industry Company,which is specialized in producing various HDPE pipe fittings such as reducer,tees,cross,flanges,check valve,end cap etc. FLANGE(BUTT JOINT): FL40 FL50 FL63 FL75 FL90 FL110 FL125 FL140 FL160 FL180 FL200SDR11 FL225SDR11 FL250SDR11 FL250SDR17 FL280SDR11 FL315SDR11 FL315SDR17 FL355SDR17 FL355SDR21 FL400SDR17 FL400SDR21 FL450SDR17 FL500SDR17 FL560SDR17 FL630SDR17