Solder Secret

Solder Secret. How to solder ???

Elkhart Prod. Corp. 31274 Reducing 90 Elbow

Copper to copper. Sweat solder fitting. No. 31274: 1 2″ to 3 8″ nominal copper No. 31290: 3 4″ to 1 2″ nominal copper No. 31298: 1″ to 3 4″ nominal copper
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