Dreaming about plumbing looks at the way we direct our emotions.
It indicates how we make use of our emotions to bypass obstacles in order to create security for ourselves and to control the flow of emotions within.
Another interpretation is that of the internal plumbing. Often, to dream of plumbing in this sense alerts us to something that is perhaps out of kilter with ourselves, with our bodies.
A leaking steam pipe might suggest, for instance, a problem with hypertension.
A pump might symbolize the heart. Obviously, such images should not be used as diagnostic tools in any way.