Phisherman wrote:
I've been reading about the proper way to vent a utility sink in the
basement. After looking at the existing plumbing I discovered that a
first floor bath and kitchen sink share a single (wet) vent. Only the
bath sink has a dry vent. I bought this house (new construction) in
1992. All the plumbing books say that every fixture must have its own
vent, yet clearly this is not the case and it passed city inspection.
Since this configuration has not had any problems since 1992, I'd say
it works just fine but not to code. Is this a common occurrence? Are
there any perfect plumbing systems?

The answer may lie in the fact that the US does
not have one single recognized plumbing code;
accepted practice varies across the country.
And even locally, there may be exceptions to
the published code(s).

So it's hard to say. But as you noted,
wet vents have pretty much gone the way
of the horse and buggy.

Jim