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The nominal diameter DN (from DN20 to DN150) and lug spacing indicate the coupling's size. They are typically made of aluminum with a white NBR rubber seal (working temperature: -10°C to +80°C) or AISI 316 stainless steel with a black FKM rubber - Viton seal (working temperature: -10°C to +180°C). Guillemin couplings have a maximum working pressure of 16 bar. Guillemin couplings without latches are bare Guillemin couplings; they can be used in an improvised manner, i.e., you can connect pipes directly to them.