Quick Connect/ Release Couplings are especially useful for pneumatic or hydraulic applications, where pressures can reach up to 5000 PSI. These Release Couplings come in different sizes that vary from 1/4", 3/8” to 1/2". These Release Couplings are also known as quick disconnect coupling that is made of brass offer a strong resistance to corrosion. Quick Connect/ Release Couplings are also suitable for many purposes like joining pipes, cables etc.