How it connects
Shipped sealed at the tip (spun closed) to permit hydrostatic pressure testing during rough-in. To connect, the domed end is cut off with a tube cutter and deburred, allowing standard compression, push-fit, or sweat mating.
Male and female halves
Male spigot (plain CTS tube exterior) mating into female CTS sockets, compression fittings, or push-to-connect stops.
Usually connects to
- compression stop valves
- push-to-connect fittings
- solder (sweat) fittings
- press fittings
Common sizes
- 1/2" CTS (5/8" actual OD) and 3/4" CTS (7/8" actual OD) are standard.
Where it is used
residential plumbingcommercial plumbingfixture rough-in (toilets, sinks, tub spouts)
Variations
- straight stub out
- 90-degree elbow stub out
- with mounting bracket/flange/ear
How to recognise it
Recognised by a smooth copper tube end rounded off into an integral spun conical or domed closed tip, usually extending from behind drywall rough-in mounting brackets or fittings.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| standard open CTS copper tube male | Stub-out has a factory spun-closed or capped dome tip requiring cutting before use. |
| threaded copper stub out | Spun closed stub outs are completely smooth plain tube with no external or internal threads. |
Also called
spun closed stub outspin closed stub outcopper stub out elbowcapped copper stub-outbullet end stub out
Good to know
Commonly installed during plumbing rough-in so lines can be pressure tested before drywall is installed. The closed end is cut off after wall completion to install shut-off angle stops.
Related connections
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