Quick-lock couplings in standard brass (not nickel-plated) with european profile. Availables in many configurations and in three sizes. Size 20 (DN 2,7) is compact dimensions and can be used in different fields, suitable for chemical, medical, pharmaceutical and similar. Size 21 (DN 5) is the most common size, so is used in various fields. Size 26 (DN 7,2) is the biggest, is used in almost every field, and is often called "universal". Supplied as standard in compliance to Reach and RoHS directives.