Pre-torque Flangeless Fittings offer a unique connection for hand-tight fittings by clicks when the resistance of the cap increases until reached the correct torque, it is made of PP or PTFE material and come with a pre-torque nut and ferrule for gas or liquid transfer. These threaded fittings are available for tubing outer diameters of 1.6/2.0/2.5/3.0/3.2mm.