Air Hose Coupling Tool - SODIAL(R)1/4BSP Female 2 Way Pass Quick Connect Coupler Air Hose Coupling Tool Silver+Blue With double way pass, 1/4BSP Female Thread to 13mm Hole Diameter. It has a 12mm 1/4BSP port on the bottom for you to connect this item into your air line. Convenient push in quick fitting provide instant tubing connections. Widely applicable for hose connection of pneumatic devices and air piping at plants, etc. This Quick fittings are only used for industrial automatic apparatus and can not be applied on any medicinal equipment.