"chickenwing" wrote in message
oups.com...
how come I wasn't told about this

This is a dielectric union. This device electrically separates the
water heater from the household piping.

http://www.hammerzone.com/archives/p...n_de/intro.htm


I donno. Did you ask? We normally just don't spout off information unless
asked!
Someone a while back had commented on the corroded mess he had on the water
line of his water heater. I recommended dielectric unions then.
Greg