Corrugated copper tube;3/4 in. Nom Female Sweat (7/8 in. I.D.) x 3/4 in. Nom Female Sweat (7/8 in. I.D.);For use in exposed locations only to connect water heaters and other water connected devices to the water supply;Patented internal dielectric sleeve effectively isolates dissimilar metals within the waterway to prevent galvanic corrosion;No dielectric union needed, the integrated dielectric sleeve eliminates the need to install an additional dielectric union, reducing time and installation costs;Engineered and tested for harsh water conditions;Indoor;Temperature rating: 40 to 140F, intermittent to 180 F;Pressure rating: 125 PSI maximum;No-lead certified;CSA and IAPMO certified;Designed, machined and assembled in the USA