1.STANDARD:GB/T 10002.2-88 2.MATERIAL:PVC 3.SIZE:25X20-63X50 4.CERTIFICATE:CE 5.EXCELLENT QUALITY,LOW PRICE,QUICK DELIVERY PVC REDUCING RING1.STANDARD:GB/T 10002.2-882.MATERIAL:PVC3.SIZE:25MMX20MM-63MMX50MM4.CERTIFICATE:CE5.EXCELLENT QUALITY,LOW PRICE,QUICK DELIVERYAdvantages:1) Healthy, bacteriological neutral, conforming to drinking water standards2) Resistant to high temperatures, good impact ...