1) Sanitary level 2) Used in milk, beverage, water treatment. 3) Polish both outside and inside 4) Stainless steel SUS304 We produce the following sized butterfly valves:DN20, 25, 32, 40, 50, 65, 80, 90, 100 Stainless steel welded elbow (unit: mm)DNSizeDA200.75"2028251"2533.5321.25"3243.5401.5"3848.5502"5160.5652.5"63.583.5803"76.188.5903.5"88.998.51004"106.1127