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MVAC Refrigerants Fitting Sizes & Label Colors

These fittings and labels must be used with alternative refrigerants when used in motor vehicle air conditioning systems. For more details, see EPA's fact sheet Choosing and Using Alternative Refrigerants for Motor Vehicle Air Conditioning.

This list includes all refrigerants found acceptable subject to use conditions in motor vehicle air conditioning as of March 29, 2011.

Fitting Sizes

Refrigerant Contact High Side Service Port Low Side Service Port 30-lb. Cylinders Small Cans
Diameter
(inches)
Pitch
(threads/inch)
Thread
Direction
Diameter
(inches)
Pitch
(threads/inch)
Thread
Direction
Diameter
(inches)
Pitch
(threads/inch)
Thread
Direction
Diameter
(inches)
Pitch
(threads/inch)
Thread
Direction
CFC-12
(post-1987)
multiple 6/16 24 Right 7/16 20 Right 7/16 20 Right 7/16 20 Right
CFC-12
(pre-1987)
7/16 20 Right 7/16 20 Right 7/16 20 Right 7/16 20 Right
HFC-134a multiple quick-connect quick-connect 8/16 16 Acme Right 8/16 16 Acme Right
Freeze 12 Technical Chemical
800-527-0885
7/16 14 Left 8/16 18 Right 8/16 18 Right 6/16 24 Right
Free Zone / RB-276 Refrigerant
Gases
888-373-3066
8/16 13 Right 9/16 18 Right 9/16 18 Right 6/16 24 Left
Hot Shot ICOR
800-357-4062
10/16 18 Left 10/16 18 Right 10/16 18 Right 5/16 24 Right
McCool
Chill-It
McMullen Oil Products, Inc.
800-669-5730
6/16 24 Left 7/16 20 Left .368 26 Right 14mm 1.25mm
spacing
Left
GHG-X4 / Autofrost People's Welding
800-382-9006
.305 32 Right .368 26 Right .368 26 Right 14mm 1.25mm
spacing
Left
GHG-X5 8/16 20 Left 9/16 18 Left 9/16 18 Left not sold in small cans
R-406A .305 32 Left .368 26 Left .368 26 Left 8/16 20 Left
GHG-HP not yet developed*
Ikon-12 / Ikon A Ikon
505-345-2707
not yet developed*
FRIGC
FR-12
Intercool
800-555-1442
quick-connect, different from HFC-134a quick-connect, different from HFC-134a 8/16 20 Left 7/16 20 Left
SP34E Solpower
888-289-8866
7/16 14 Right 8/16 18 Left 8/16 18 Left 5/16 24 Left
R-426A
(RS-24, new formulation)
Refrigerant Solutions Ltd Quick connect, different from HFC-134a and FRIGC FR-12 Quick connect, different from HFC-134a and FRIGC FR-12 Quick connect, different from HFC-134a and FRIGC FR-12 Quick connect, different from HFC-134a and FRIGC FR-12
R-420A RMS of Georgia 0.5625 (9/16) 18 Right 0.5625 (9/16) 18 Left 0.5625 (9/16) 18 Left 0.5625 (9/16) 18 Right
HFO-1234yf Honeywell Quick connect as in SAE J 639 (2011); different from HFC-134a, FRIGC FR-12, and R-426A Quick connect as in SAE J 639 (2011); different from HFC-134a, FRIGC FR-12, and R-426A Quick connect consistent with SAE J 2844 (2011)+ Not yet developed; additional information to be submitted to EPA.
R-152a   not yet developed* not yet developed* not yet developed* not yet developed*
R-744 (CO2)   18.1 +0/-0.2 mm (0.7126 +0/-0.0078 inches) Outside diameter of 16.6 +0/-0.2 mm (0.6535 +0/-0.0078 inches) 20.955 +0/-0.127 mm (0.825 +0/-0.005 inches) and right-hand thread direction Not yet developed; additional information to be submitted to EPA.
* These refrigerants have not been marketed yet; therefore, fittings have not been developed.
+ Direct final rule published March 26, 2012 and effective May 21, 2012 will change this to a left-handed screw fitting with diameter 8/16 inches and Acme shaped threading with 16 threads per inch, consistent with SAE J 2844 (October 2011 edition).

Label Colors

To comply with the conditions on the use of motor vehicle refrigerants, a detailed label must be applied that features a unique background color. This table summarizes the colors chosen for the refrigerants listed as of June 3, 1997. The information required for each label is listed in EPA's fact sheet Choosing and Using Alternative Refrigerants for Motor Vehicle Air Conditioning.

Refrigerant Background
CFC-12 White
HFC-134a Sky Blue
Freeze 12 Yellow
Free Zone / RB-276 Light Green
Hot Shot Medium Blue
GHG-X4 Red
R-406A Black
GHG-X5 Orange
GHG-HP not yet developed*
Ikon-12 / Ikon A not yet developed*
FRIGC FR-12 Grey
SP34E Tan
R-426A (RS-24, new formulation) Gold
R-420A Dark green (PMS #347)
* These refrigerants have not been marketed yet; therefore, label colors have not been developed.

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