Originally Posted By: jgallant
This post was automatically imported from our archived forum.
On two houses I inspected today, one from 1987, the other new construction, both had water heater temperature pressure relief valve drain lines using flexible copper tubing, where the narrow, upstream end was less than 3/4" outside diameter. This makes the inside diameter close to if not equalling 5/8". Everything I’ve read and heard says that the inside diameter of these drain lines should be 3/4" or larger.
An inspector friend of mine who's opinion I value said, yes, technically it's a violation, but that if the rest of the water heater installation looks correct then he wouldn't recommend any correction.
See attached jpeg. What's your opinion?