... of attractive external appearance. 7.JINYOU 304stainless steel sleeves sizeSingle Single flared stainless steel sleeve Size DIA 12,14,16,18,20 ... ,25,32MM Double flared stainless steel sleeve Size DIA 12,14,16,18,20,25, ... . Used for fastening, joining, or reinforcement ,such as for facilities of cold water, sanitary hot water, and heating ect. Stainless steel fitting for aluminum-plastic ...