Random tower ring: materials:304,304L,316,316L,410 diameter:25mm 38mm,50mm,76mm good quality and nice price Random tower ring 1.Advantage:Owing to its thin wall,high void and capacity,low fluid resistance,and heat&corrosion resistance,metallic packings include carbon steel or stainless steel applied to handle the thermal-sensitive,hard to separation and easy carbonized materials in the vacuum ...