If you’re looking for the anti-friction sleeve used in suspension components or rotating machinery, this isn’t that part. In plumbing, a “bushing” is a completely different object: a short, hollow fitting used to connect two pipes or fittings of different diameters. For the mechanical sleeve bushing covered elsewhere on this site, see What Is a Bushing?
What a Plumbing Bushing Does
A plumbing (or pipe) bushing acts as a size adapter — it’s typically threaded on the outside to match a larger pipe or fitting opening, and threaded (or otherwise sized) on the inside to accept a smaller pipe. That lets a larger pipe run “step down” to a smaller one without needing a full reducer coupling. Common materials include PVC, brass, and stainless steel, depending on the piping system.
Why the Same Word Means Two Different Things
Both the plumbing fitting and the mechanical anti-friction sleeve are called “bushings” because the word’s older meaning — a lining or sleeve inserted into an opening — applies loosely to both. But functionally they’re unrelated: a plumbing bushing adapts pipe diameter and carries fluid; a mechanical bushing supports a moving shaft and reduces friction. Neither one does the other’s job.
Why This Page Exists
SYZ Machine’s Bushings resource hub covers mechanical bushings — suspension components, industrial sliding bearings, and related parts, not plumbing fittings. Rather than force an automotive angle onto a plumbing term where it doesn’t apply, this page exists to point you to the right place.
If you’re actually looking for automotive or mechanical bushing content, start with What Is a Bushing? or Types of Automotive Bushings by Mounting Location.
Related reading: What Is a Bushing? Definition, Materials, and How It Works · What Is a “Bond Bushing”? (Not a Suspension or Mechanical Part)
