Wrot Copper 90-Degree Ftg x C Fitting Elbow NIBCO copper fittings are manufactured in an ISO 9001 certified facility, and backed by a 50-year limited warranty.1/2 in.Lead-free wrot copper solder pressure 90° intermediate elbow is used in residential and commercial systems such as potable water, air conditioning and refrigerationDezincification resistantLead-free wrot copper solder pressure 90° close rough fitting elbow is durable and low maintenanceOptions include cleaned and bagged for oxygen service medical gasMSS SP-104ASME B16.