The cottage has electricity but no 'indoor plumbing'. [=the cottage does not have a toilet or sink; there are no pipes that supply clean water to the cottage]
a store that sells 'plumbing fixtures' [=sinks, toilets, faucets, etc.]
a scientist who spent her life 'plumbing' the minds of criminals
(..) -lt all fits. -How's a basilisk been getting around? A dirty, great snake. Someone would have seen it. -Hermione's answered that too. -Pipes? lt's using the plumbing. Remember what Aragog said about that girl years ago? She died in a bathroom? What if she never left? Moaning Myrtle. (..)2002 Harry Potter and the Chamber of Secrets