The reducing coupling features solder cups. The fitting provides a means of connecting larger size tube to smaller size tube. NIBCO copper fittings are manufactured in an ISO 9001 certified facility, and backed by a 50-year limited warranty.Lead-free wrot copper solder reducing coupling is used in residential and commercial systems such as potable water, air conditioning and refrigerationDezincification resistantLead-free wrot copper solder reducing coupling is durable and low maintenanceOptions also include cleaned and bagged for oxygen service medical gasMSS SP-104ASME B16.22Third-party certified to NSF/ANSI 61 and 372