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Keith Specialty Store
6791 Rt 119 Hwy N,  Marion Center, PA 15759
US callers: 800-705-8838
FAX: 724-397-2228
Canada: 724-397-8838
8:00am-6:00pm  M-F, 8:00am-3:00pm Sat. (ET)

Plum Brass Compression-groups

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.

o.d. [outside diameter] to i.d. [inside diameter] tubing size conversion

tubing o.d.   tubing i.d.
1/4" 1/8"
3/8" 1/4"
1/2" 3/8"
5/8" 1/2"
Example:
Use 1/2" flare fittings
on 3/8" i.d. copper.
For small sizes, i.d. plus 1/8" equals o.d..

 

Definitions:  
  comp = male threaded compression fitting.
  mipt = male iron-pipe-size thread fitting.
 

fipt = female iron-pipe-size thread.

  • 04-010.jpg
    compression ferrules (rings)
    Replacement ferrules (rings) for compression fittings. Use brass ferrules on copper and aluminim tubing. Use nylon ferrules on vinyl and poly tubing. Never re-use ferrules.
    1/4 OD compression ferrule sku: 04-004, ($0.09) 3/8 OD compression ferrule sku: 04-006, ($0.13) 1/2 OD compression ferrule sku: 04-008, ($0.15) 5/8 OD compression ferrule sku: 04-010, ($0.18) 1/4 OD nylon compression ferrule sku: 04-012, ($0.19) 3/8 OD nylon compression ferrule sku: 04-014, ($0.14)
  • 04-040.jpg
    compression nuts (female compression)
    Replacement brass compression nuts for compression fittings. Compression nuts can be re-used. Examine them for hairline cracks or stripped threads.
    1/4 OD compression nut sku: 04-034, ($0.29) 3/8 OD compression nut sku: 04-036, ($0.39) 1/2 OD compression nut sku: 04-038, ($0.64) 5/8 OD compression nut sku: 04-040, ($0.82)
  • 04-311.jpg
    compression x compression couplings (unions)
    Compression couplings are used to join two pieces of the same size tubing. They also act as unions because they can be taken off and put back together by loosening one or both nuts.
    1/4 OD compression coupling sku: 04-305, ($1.36) 3/8 OD compression coupling, lead free sku: 04-307, ($1.97) 1/2 OD compression coupling sku: 04-309, ($2.85) 5/8 OD compression coupling sku: 04-311, ($3.51) 7/8 OD compression coupling sku: 04-313, ($7.85)
  • 04-330.jpg
    compression x compression reducer couplings (unions)
    Compression reducer couplings are used to join two pieces of different size tubing. They also act as unions because they can be taken off and put back together by loosening one or both nuts.
    1/2 x 3/8 OD compression coupling, lead free sku: 04-325, ($2.59) 5/8 x 3/8 OD compression coupling sku: 04-330, ($3.09)
  • 04-128.jpg
    compression x male (mipt) adapters
    Compression x male adapters attach tubing to a female (fipt) pipe thread fitting.
    1/4 OD compression x 1/8 male sku: 04-105, ($1.10) 1/4 OD compression x 1/4 male, lead free sku: 04-106, ($1.27) 3/8 OD compression x 1/8 male sku: 04-125, ($1.18) 3/8 OD compression x 1/4 male sku: 04-126, ($1.50) 3/8 OD compression x 3/8 male, lead free sku: 04-127, ($1.87) 3/8 OD compression x 1/2 male, lead free sku: 04-128, ($2.62) 1/2 OD compression x 1/4 male sku: 04-145, ($1.85) 1/2 OD compression x 3/8 male, lead free sku: 04-146, ($2.08) 1/2 OD compression x 1/2 male sku: 04-147, ($2.92) 5/8 OD compression x 3/8 male sku: 04-165, ($2.58) 5/8 OD compression x 1/2 male sku: 04-166, ($2.96) 7/8 OD compression x 3/4 male sku: 04-185, ($5.13)
  • 04-246.jpg
    compression x female (fipt) adapters
    Compression x female adapters attach tubing to a male (mipt) pipe thread fitting or threaded pipe.
    3/8 OD compression x 1/4 female sku: 04-225, ($1.73) 3/8 OD compression x 3/8 female sku: 04-226, ($1.73) 3/8 OD compression x 1/2 female sku: 04-227, ($2.21) 1/2 OD compression x 1/2 female sku: 04-246, ($2.22) 5/8 OD compression x 1/2 female sku: 04-247, ($3.09)
  • 04-411.jpg
    compression x compression 90 degree ells
    Compression ells join two pieces of the same size tubing to form a 90 degree bend. Use these compression ells when a short radius turn is needed to prevent kinking the tubing.
    3/8 OD compression 90 ell sku: 04-407, ($2.40) 1/2 OD compression 90 ell sku: 04-409, ($3.72) 5/8 OD compression 90 ell sku: 04-411, ($5.22)
  • 04-446.jpg
    compression x male (mipt) 90 degree ells
    Compression x male ells attach a piece of tubing to a female (fipt)fitting to form a 90 degree bend. Use these compression x male ells when a short radius turn is needed to prevent kinking the tubing.
    1/4 OD compression x 1/8 male ell, lead free sku: 04-425, ($1.50) 3/8 OD compression x 1/4 male ell, lead free sku: 04-445, ($1.92) 3/8 OD compression x 3/8 male ell sku: 04-446, ($2.10) 3/8 OD compression x 1/2 male ell sku: 04-447, ($2.84)
  • 04-511.jpg
    compression x compression x compression tees
    Compression tees join three pieces of the same size tubing to form a tee connection. Use these compression tees to branch off of an existing tubing.
    1/4 OD compression tee sku: 04-505, ($2.28) 3/8 OD compression tee sku: 04-507, ($3.56) 1/2 OD compression tee sku: 04-509, ($5.33) 5/8 OD compression tee, lead free sku: 04-511, ($9.16)
  • 04-625.jpg
    compression x copper sweat (solder) adapter
    Compression x copper sweat adapters attach tubing to a piece of copper by soldering.
    3/8 OD compression x 1/2 copper sku: 04-625, ($2.23)
  • 04-807.jpg
    compression x compression shut-off valves
    Compression shut-off valves join two pieces of the same size tubing and allow the flow of liquid to be turned off and on.
    1/4 OD compression shut off valve sku: 04-805, ($5.48) 3/8 OD compression shut off valve sku: 04-807, ($6.43)