Horn Pep Quick Couplings use steel and stainless steel materials through precise CNC machine work over;moreover,we have chosen excellent materials for the tab stop plug which has undergone a hardness treating process and has an excellent hermetical seal to avoid leaking and worn down features.Stainless steel #316 materials is for chemicals,food,and other special materials. One touch quick coupling is a patented product which focuses on durability,pressure,and easy operating.One touch quick coupling is also available for the operator who requires air pressure over 10kg/cm.