... stainless steel sleeve. 2.3.Various size. JINYOU Stainless steel ferrule fittings for pipe 1. Very easy of installing. 3. ... Perfect watertightness, Anti-rust, leak-proof water, good strength, long life . 4. Double o-ring seal, ... , joining, or reinforcement ,such as for facilities of cold water, sanitary hot water, and heating ect. Stainless steel ferrule fittings for pipe