Plum Brass Compression-Groups
These 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 at the bottom of this page for OD to ID comparison.
O.D. [Outside Diameter] to I.D. [Inside Diameter] Tubing Size Conversion
|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.