It looks like Swell Fitting itself isnt a standard technical term in plumbing or engineering but heres how the two words are used in possible relevant contexts:
1. If you meant a product or brand name
Sometimes Swell appears as part of brand names or product lines for fittings used in plumbing (e.g., hosetail fittings, pressure pipe unions, threaded sockets) sold under the Swell brand. These are just regular pipe fittings used to join, adapt, or connect pipes in systems like garden ponds or pressure pipework not a special type of fitting named swell fitting in technical terminology.
2. If youre asking what a fitting is
In piping/plumbing, a fitting is any component used to connect, redirect, or terminate pipes (like elbows, tees, reducers, couplings, etc.) so fluid can flow correctly through a system.
3. If you meant swell + fitting literally
The word swell on its own means to expand or bulge like swelling due to pressure, water, etc.
So taken literally, swell fitting could be interpreted as a fitting that expands or bulges to make a seal similar in concept to how some hydrophilic swelling gaskets or swellable hoses work in waterproofing or construction joints. But thats not a standard pipe fitting category in plumbing (the correct terms would be things like swelling seals or swellable gaskets in waterproofing systems).
Summary
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Swell Fitting isnt a standard technical term for a unique type of pipe fitting.
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In many cases it may just be a brand/model name for ordinary plumbing connectors from a manufacturer.
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If youre asking for a general definition of fitting, its a component used to connect or adapt pipes.
If you want, tell me the context (e.g., plumbing, construction, a picture, where you saw it, or what youre trying to do), and I can give a precise explanation of the fitting youre referring to!