coupling size:3"-12" with iso9001, CE and WRAS certificate high quality and reasonable ... *1753"100Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC109.6-127.8M12*1754"150Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp ... *2008"250Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC272.0-289.0M12*21510"300Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp ...