I have yet to meet a professional plumber who is female, and I've met a lot of plumbers (I'm in construction). Just saying, it's jarring.
In Portugal I was very amazed by the large amount of women driving buses, taxis and garbage trucks (for instance). Back in Brazil I must have seen at most five or six but in Portugal it is a very common sight.
Now for this kind of specialized trade jobs like plumbers, electricians and auto mechanics I personally never seen a woman doing it in both sides of the pond.