http://www.nachi.org/forum/attachment.php?attachmentid=101926&stc=1&d=1442073437
No drip leg on gas line.
No drip leg on gas line to allow cleaning of sediment that may collect.
No screw on flue pipe and flue pipe is not over the flue exhaust on water heater. The flue pipe is corroded and loose.
“flue pipe” is called a draft diverter