Used in potable water application

Advantages:

-Molded the sleeve as an integral part of the nut, eliminating the need for a two-piece assembly.

-Good electrical insulating qualities which eliminate electrolytic action that usually corrodes tubing when dissimilar metal meets a fitting.

-Ability to absorb mechanical and acoustical vibrations because of the low density and softness of plastic

-An inherently low resistance to flow, due to smooth internal surface.

-Resistance to scale buildup.