. Couplings include both male and female components, which are usually installed on the hose or compressed air supply source, and the male component is installed on the wind instrument or equipment. Material couplings are also divided into two types, manual and automatic. There are two types of couplings in the way they are connected to the male part or the so-called coupling sequence. It does not have and is connected with the least pressure. Elite couplings with chrome plating have significant resistance to wear and temperature changes. Ard.