About 5 years ago I replaced a gas water heater and used 18" flex SS braide
d pigtails between the unit and the pipes. Last night a flex coupler devel
oped a spray, flooded the garage, and ruined the wall panel.
Come to find out the flex connectors are plastic pipe with a SS braid cover
ing. The flex ends at the wall pipes were good & solid but the ends at the
water heater were totally mush/putty like! It looks like the heat from th
e tank or the heat from the flue had dissolved them over time. Will never
use them again! I used solid corrigated SS flex this time and won't have t
he plastic to worry about.