Compression fittings are used primarily for water on copper, vinyl, or poly (plastic) tubing. They may be used for oil, but we recommend flare fittings instead.
Unless labeled "lead free", these fittings may not be used in potable water systems.
Do NOT use these compression fittings for lines carrying pressurized gases.
Compression threads are a very different pitch from iron pipe size threads (or national pipe thread taper). Use a male or female adapter to transition between them.
All compression fittings are listed by OD [outside diameter]. See chart for OD to ID comparison.
|tubing o.d.||tubing i.d.|
Use 1/2" flare fittings
on 3/8" i.d. copper.
|For small sizes, i.d. plus 1/8" equals o.d..|
|comp = male threaded compression fitting.|
|mipt = male iron-pipe-size thread fitting.|
fipt = female iron-pipe-size thread.