Pro-Fit® thread design allows assembly with all female thread NPT forms. The new model is interchangeable with tapered thread fittings. The special sealing method has a locking effect similar to that of the taper model. Since the sealing ring is made of PTFE, it is not subject to wear and can be used repeatedly. Thread tape and thread sealants of other materials can be replaced, eliminating the need for full-length NPT thread, thus reducing the fitting size. Sealing is achieved on inclined, concave and convex surfaces.