It is common procedure to sweat a male adaptor to copper pipe. About six
inch long piece. Let the pipe section and male adaptor cool. Thread the
newly created pipe with threads into the WH fitting. Use both teflon tape,
and Rectorseal, to seal the threads.
Make the last sweat fitting at the end of the six inch pipe, which is away
from the WH. Use a roll stop coupler if you don't figure to be doing this
very often. Copper union if you think you might need another WH and want the
convenience of easy disassembly.
Christopher A. Young
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