A solder ring fitting is a pre-soldered capillary connector for joining copper pipes used in plumbing. During the manufacture of these precision-made ?ttings, a ring of high quality lead-free solder is positioned in each capillary socket. When heat is applied, the solder is released into the gap between the tube and the ?tting, resulting in a totally sound joint without the need to end feed additional solder. As a professional and reliable copper pipe fittings manufacturer, we provide the size of 8mm-54mm of the full range of products, which are made from copper. The impermeable nature of the solder ring fittings gives excellent protection against contaminants that can threaten the domestic water supply.