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When the job calls for something a little more robust than your standard parkway enclosure, these heavy traffic boxes will be are your go-to. These enclosures were designed specifically to meet AASHTO's H-20 load rating.

Name
Description
Width
Length
Diameter
Height
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B1017 Box
H20 Traffic Rated 10"x17" I.D. Box (Caltrans #3-1/2T)
10"
17"
-
12"
B1017 Box
B1324 Box
H20 Traffic Rated 13"x24" I.D. Box (Caltrans #5T)
13"
24"
-
12"
B1324 Box
B1730 Box
H20 Traffic Rated 17"x30" I.D. Box (Caltrans #6T)
17"
30"
-
12"
B1730 Box
B2436 Box
H20 Traffic Rated 24"x36" I.D. Box
24"
36"
-
12"
B2436 Box
B3048 Box
H20 Traffic Rated 30"x48" I.D. Box
30"
48"
-
12"
B3048 Box
G3T Box
H20 Traffic Rated 10" I.D. Round Box (Interchanges w/ Brooks #3RT)
-
-
10"
12"
G3T Box
G4 Box
H20 Traffic Rated 10" I.D. Round Box (Interchanges w/ Brooks #4TT)
-
-
10"
12"
G4 Box
G5T Box
H20 Traffic Rated 10" I.D. Round Box w/ Bolt Down Provisions
-
-
10"
12"
G5T Box
G8T Box
H20 Traffic Rated 13" I.D. Round Box w/ Bolt Down Provisions
-
-
13"
12"
G8T Box
G12 Box
H20 Traffic Rated 14" I.D. Round Box
-
-
14"
12"
G12 Box

Heavy Traffic