concentric reducer is well protected, quality, compact, good, and the appearance flat, ... "4) Standards: ISO, DIN, SMS, IDF, 3A5) Seal Ring: Silicon rubber, EPDM or FPM6) Application: Pharmacy, beer, food, dairy, beverage, cosmetic ... , Cross, Union, Clamps, Sightglass, Cleaning balls and so on. concentric reducer(all size)