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I need to lengthen a water supply line to a sink. The ½” copper supply line routs up through the bottom of the cabinet. Questions: 1) To lengthen the supply line I wanted to add a coupling, an extension, and a shut-off valve. What is the minimum distance I should try to maintain between the sweated on coupling and the sweated on shut-off valve? When I sweat on the shut-off valve I do not want to create a leak at the previous sweated on coupling . 2) What is the minimum distance I should have between the cabinet floor and the shut-off valve? I do not have anything which is fire retardant to help protect the cabinet from the torches heat/flame. The coupling and supply extension will be installed after the old cabinet is removed and before the new cabinet is installed. The shut-off valve will be installed after the new cabinet is installed. I want to be able to sweat the fittings, but I only have a few successes under my belt. I am willing to learn and do. Looking for your advice. Thanks Danl
