Fittings can be differentiated according to their functional principle. Push in fittings are the standard on the market and the most widely used. They are characterized by the simple tube release function, by the actuation of a releasing ring. These fittings are used with the standard O.D. tubing commonly available on the market.
Barbed fittings have historically been the predecessor of push in fittings. Here a standard I.D. tube is inserted over a nipple. In the CK version, additional mechanical securing is achieved by means of a union nut.
Threaded fittings are connecting elements which serve to produce others from existing threads. No hose can be connected directly here.
The click fitting NPKA is made entirely of polymer and does not contain any metal. Furthermore, the patented release mechanism is unique on the market. If you want to install hoses quickly and easily with one hand, the NPKA fitting is a good choice.