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ONE = LID LETTERING
G = Gas
V = Vent

TWO = BOX SIZE
2 = 2"

THREE = LID MATERIAL (& LID TYPE)
I = Iron
P = Plastic

Only use these codes with Group Four - Code L:

I3 = Iron (Flush)

IT = Iron (Threaded)

FOUR = UPPER TUBE STYLE
C = Plastic Flange Top with Cast Iron Collar
F = Plastic Flange Top
H = Heavy Duty Iron Flange Top
S = Straight Top Flange

L = Light Duty Top Iron Flange

FIVE = ADJUSTABLE RANGE (Measured from the top of the box to the bottom of the box.)

If you chose CODE C, F or S from GROUP FOUR, choose from the following codes: 

A = 18 ⅝" - 24"                    G = 30 ⅝" - 48"
B = 20 ⅝" - 28"                     H = 37 ½" - 62"
C = 22 ⅝" - 32"                     K = 51 ½" - 76"
D = 24 ⅝" - 36"                     L = 63 ½" - 88"
E = 26 ⅛" - 39"                     M = 75 ½" - 100"
F = 27 ⅝" - 42"                     

If you chose CODE H from GROUP FOUR, choose from the following codes: 

A = 21 ⅜" - 26 ¾"            G = 33 ⅜" - 50 ¾"
B = 23 ⅜" - 30 ¾"            H = 40 ⅜" - 64 ¾"
C = 25 ⅜" - 34 ¾"            K = 54 ¼" - 78 ¾"
D = 27 ⅜" - 38 ¾"            L = 66 ¼" - 90 ¾"
E = 28 ⅞" - 41 ¾"            M = 78 ¼" - 102 ¾"
F = 30 ⅜" - 44 ¾"                   

SIX = SUPPORT SYSTEM MODIFICATION AND SPECIAL BELLS
If you are using a support with your Curb Box, one of the codes below is required:

SEVEN - LID COLOR
(Yellow is Standard)
A = Black                        D = Red
B = Blue                          E = White
C = Green                        F = Orange

EIGHT = FLANGE COLOR 
(Silver is Standard)
G = White
H = Yellow
J = Black

NINE = TRACER WIRE HOLES
(Not Available on Heavy Duty Boxes)
K = Tracer Wire Holes

TEN = VENT HOLE
L = One 3/8" Vent Hole (Mandatory for Group Four Codes C, F and H)
N = Two 3/8" Vent Holes

ELEVEN = MAGNET
(One Magnet Located in the Flange is Standard, except on Group Four - Code L)
P = No Magnet at all
Q = One Magnet in the Lower Tube
R = One Magnet in the Upper Tube and One in the Lower Tube