ASTM SPECIFICATIONS C478 Precast Reinforced Concrete Manhole Sections C497 Standard Methods of testing Concrete Pipe, Manhole
Sections or Tile C923 Resilient Connections Between Reinforced Concrete Manhole Structures and Pipes C443 Joints for Circular Concrete Sewer and Culvert Pipe Using Rubber Gaskets C990 Joints for Concrete Pipe, Manholes and Precast Box Sections Using Preformed Flexible Joint Sealants
MANHOLE INDEX
Tammy
click mouse on desired subject
M1
SU
MP
AS
RE
QU
IRE
D
FLAT BASE
INTERMEDIATE SECTION
COVER (Offset or Center Hole As Required)
GRADE RING
CAST IRON FRAME AND COVER.
See chart page M17
See chart page M18
See chart page M20
See chart page M23
STANDARD STORM MANHOLE ASSEMBLY A11050 to 3600 mm DIAMETER42 to 144 in. DIAMETER
M2
GRADE RING
INTERMEDIATE SECTION
COVER (Offset or Center Hole As Required)See chart page M20
BENCHED BASE
See chart page M18
See chart page M23
CAST IRON FRAME AND GRATE.
See chart page M17
FOR LIFTING PURPOSES - 3000mm/120" and 3600mm/144" bases shouldbe benched on site due to excessive weight of the bases.
NOTE:
STANDARD MANHOLE ASSEMBLY A21050 to 3600 mm DIAMETER42 to 144 in. DIAMETER
M3
ECCENTRIC CONE - EC1
BENCHED BASE - 1200mm/48 in.
INTERMEDIATE SECTION - 1200mm/48 in.
INTERMEDIATE SECTION - 1050mm/42 in.
GRADE RING
Available in 305mm/12 in. laid height increments
See chart page M23
CAST IRON FRAME AND COVER.
See chart page M18
See chart page M18Available in 305mm/12 in. laid height increments
610mm/24 in. Laid heightSee chart page M19
See chart page M17Available in 305mm/12 in. laid height increments
COVER (Center Hole As Required)See chart page M20
CONICAL MANHOLE ASSEMBLY A31200 Reduced to 1050 mm DIAMETER48 Reduced to 42 in. DIAMETER
M4
1219mm/48 in. laid height
See chart page M17
Available in 305mm/12 in. laid height increments
*
See chart page M23
CAST IRON FRAME AND COVER.
See chart page M18
See chart page M19
See chart page M18
Available in 305mm/12 in. laid height increments
Other section heights not recommended
305mm/12 in. laid height
*
ECCENTRIC CONE - EC2
BENCHED BASE - 1200mm/48 in.
INTERMEDIATE SECTION - 1200mm/48 in.
INTERMEDIATE SECTION - 750mm/30 in.
GRADE RING
COVER (Center Hole As Required)See chart page M20
CONICAL MANHOLE ASSEMBLY A41200 Reduced to 750 mm DIAMETER48 reduced to 30 in. DIAMETER
M5
915mm/36 in. laid height
See chart page M17
Available in 305mm/12 in. laid height incrementsSee chart page M18
305mm/12 in. laid height
See chart page M23
CAST IRON FRAME AND COVER.
See chart page M19
See chart page M18
Available in 305mm/12 in. laid height increments
*
* Other section heights not recommended
ECCENTRIC CONE - EC3
BENCHED BASE - 1050mm/42 in.
INTERMEDIATE SECTION - 1050mm/42 in.
INTERMEDIATE SECTION - 750mm/30 in.
GRADE RING
COVER (Center Hole As Required)See chart page M20
CONICAL MANHOLE ASSEMBLY A51050 Reduced to 750 mm DIAMETER42 reduced to 30 in. DIAMETER
M6
1219mm/48 in. laid height
See chart page M17
Available in 305mm/12 in. laid height incrementsSee chart page M18
305mm/12 in. laid height
See chart page M23
CAST IRON FRAME AND COVER.
See chart page M19
See chart page M18
Available in 305mm/12 in. laid height increments
Other section heights not recommended
*
*
ECCENTRIC CONE - EC4
BENCHED BASE - 1050mm/42 in.
INTERMEDIATE SECTION - 1050mm/42 in.
INTERMEDIATE SECTION - 600mm/24 in.
GRADE RING
COVER (Center Hole As Required)See chart page M20
CONICAL MANHOLE ASSEMBLY A61050 Reduced to 600 mm DIAMETER42 reduced to 24 in. DIAMETER
M7
610mm/24 in. laid heightSee chart page M19
See chart page M17
Available in 305mm/12 in. laid height incrementsSee chart page M18
915mm/36 in. laid heightSee chart page M19
*
See chart page M23
CAST IRON FRAME AND COVER.
See chart page M18
Available in 305mm/12 in. laid height increments
*
305mm/12 in. laid height
Other section heights not recommended
ECCENTRIC CONE - EC1
BENCHED BASE - 1200mm/48 in.
INTERMEDIATE SECTION - 1050mm/42 in.
ECCENTRIC CONE - EC3
INTERMEDIATE SECTION - 750mm/30 in.
GRADE RING
COVER (Center Hole As Required)See chart page M20
CONICAL MANHOLE ASSEMBLY A71200/48 Reduced to 750 mm / 30 in. DIAMETER
M8
GRADE RING
INTERMEDIATE SECTION
REDUCING SLAB
COVER (Offset or Center Hole As Required)
FLAT or BENCHED BASE
INTERMEDIATE SECTION
CAST IRON FRAME AND COVER.
See chart page M20
See chart page M23
See chart page M18
See chart page M17
See chart page M18
See chart page M22
REDUCING SLAB ASSEMBLY A8750 to 3600 mm DIAMETER30 to 144 in. DIAMETER
M9
kg/lbs.
MASS/WEIGHTFLAT BASE
BASE (Metric / Imperial)
HEIGHTmm/in.mm/in.
DIAMETERBASE
1524mm/60 in. laid height
305/12, 1219/48 and 1524mm/60 in. laid heightsSee chart page M18
See chart page M23
See chart page M17
118mm (4 5/8 in.)
CAST IRON FRAME AND GRATE.S
UM
P A
S R
EQ
UIR
ED
1214/2670
750/30
1219/48750/30
750/30 1464/32201524/60750/30
BASE - 750mm/30 in.
INTERMEDIATE SECTION - 750mm/30 in.
GRADE RING
COVER (Center Hole As Required)See chart page M20
STANDARD TYPE 5 CATCHBASIN750 mm DIAMETER30 in DIAMETER
M10
SU
MP
AS
RE
QU
IRE
D
FLAT BASE
INTERMEDIATE SECTION
COVER (Offset or Center Hole/Square Opening As Required)
GRADE RING
CAST IRON FRAME AND COVER.
See chart page M17
See chart page M18
See chart page M20 / M21
See chart page M23
STANDARD TYPE 6 CATCHBASIN1050 to 3600 mm DIAMETER42 to 144 in. DIAMETER
M11
TOP VIEW
610mm
24 in.
432mm
17 in.
Cast iron frameand grate.
or as
457mm18 in.
required
1758/3875
1281/2825
24 in.
610mm
61
0m
m
24
in.
127mm
5 in.
34 in.
24 in.
610mm
864mm
127mm
5 in.
17
27
mm
76
2m
m3
0 in
.
600x600/24x24
600x600/24x24
1727/68
68
in.
1219/48
kg/lbs.
MASS/WEIGHT
(Metric / Imperial)
mm/in.DIAMETER
CATCHBASIN CATCHBASIN
SQUARE CATCHBASIN
HEIGHTmm/in.
STANDARD SQUARE CATCHBASIN600 mm Square24 in. Square
M12
10
in.
25
4m
m
10
in.
25
4m
mGROUT AS REQUIRED
250mm/10 in. DIAMETEROPENING STANDARD
152mm
6 in.
552/1215
76
2/3
0
18 in.6 in.
610/24
30 in.
15
2m
m6
in.
152mm
450x450/18x18
45
7m
m
61
0m
m2
4 in
.
18
in.
457mm
762mm
Cast iron frameand grate.
762/30
635/1400
kg/lbs. kg/lbs.FRAME AND GRATEMASS/WEIGHT C/WFLAT BASE
HEIGHTmm/in.
SLUICE BOX
mm/in.DIAMETER
SLUICE BOX MASS/WEIGHT
(Metric / Imperial)
TOP VIEW
STANDARD SLUICE BOX750 mm Square30 in. Square
M13
See chart page M17
See chart page M18
See chart page M20
See chart page M23
CAST IRON FRAME AND COVER.
OPTIONAL
OPTIONAL
406mm
203m
m
406mm
508m
m
1524
mm
VALVES BY OTHERS
BASE PADS
16 in.
16 in.
8 in
.
20 in
.
60 in
.
BASE
INTERMEDIATE SECTION
COVER
GRADE RING
TOP VIEW OF BASE PADS
VALVE CHAMBER ASSEMBLY1050, 1200 and 1500 mm DIAMETER42, 48 and 60 in. DIAMETER
M14
ACCESS FRAME AND COVER
COVERSee page M20
See chart page M18INTERMEDIATE SECTION
(optional)
FLAT BASESee chart page M17
VARIES
GASKETCAST-IN
Mechanical and Electrical equipment to be supplied by others.
(SLOPED AS REQUIRED)CONCRETE GROUT
NOTE:
STANDARD SEWAGE LIFT STATION1200 to 3600 mm DIAMETER48 to 144 in. DIAMETER
M15
CONTAINMENT CHAMBER
STORMCEPTORS
TUNNELS
LIFT STATIONS
REDUCING
SECTION
FLAT BASESTANDARD
COVER
OutletInlet
STORMCEPTORSTANDARD
FLATCOVER
SECTION
HALF SECTION
FLAT BASE
FLAT COVER
HALF SECTION
SECTION
MONOBASESECTION
OPTIONAL
MECHANICALSERVICES
SECTION
APPLICATIONS FOR LARGE DIAMETER UNITS3000 to 3600 mm DIAMETER120 to 144 in. DIAMETER
M16
8" to
21"
51mm (2")
Standard diameter
150m
m
(6")
Min
.
51mm(2")
305 or 381mm(12" or 15")
Sta
ndar
d la
id h
eigh
t
Standard diameter
Sta
ndar
d la
id h
eigh
t
Standard pipe diameter
Standard wallthickness
Standard wallthickness
Standard wallthickness
Standard pipe diameter
203
to 5
33
NOTE: Custom sizes available upon request
INTERMEDIATE INTERNAL DROP SECTION
INTERMEDIATE INTERNAL TOP DROP SECTION
TYPICAL PLAN VIEW
FLOW
STANDARD INTERNAL DROP SECTIONS1200 and 1500 mm DIAMETER48 and 60 in. DIAMETER
M17
THICKNESSWALL
HEIGHTFLAT BASE
MASS/WEIGHT
mm/in.mm/in.kg/lbs.
HEIGHTLAID
THICKNESSBASE SLAB
mm/in.
MASS/WEIGHT
BASES
MANHOLEDIAMETER BASE HEIGHT
BENCHED
mm/in. mm/in. kg/lbs.
114/4.5
127/5
178/7
152/6
1219/48
915/36
610/24
305/12
915/36
610/24
1524/60
1219/48
305/12
1524/60
1219/48
610/24
915/36
305/12
915/36
1219/48
1524/60
610/24
1829/72
305/12
3500/7715
4112/9065
2379/5245
5826/12845
4965/10945
4103/9045
3241/7145
1724/3800
780/1720
1107/2440
1433/3160
959/2115
1388/3060
1810/3990
2275/5015
1662/3665
2620/5775
2204/4860
2887/6365
4724/10415
203/8
203/8
152/6
152/6
229/9
203/8
298/11.75
330/13
1219/48
305/12
610/24
915/36
1829/72
1219/48
915/36
610/24
305/12
2438/96
2438/96
610/24
1219/48
915/36
305/12
305/12
1219/48
915/36
610/24
2438/96
8482/18700
6591/14530
4128/9100
5579/12300
7031/15500
5457/12030
4323/9530
3189/7030
6688/14745
14288/31500
15681/34570
8537/18820
10918/24070
13300/29320
25207/55570
21399/47175
11941/26325
15094/33275
18246/40225
11127/24530
34009/749752438/96
203/8
203/8
305/12
305/12
1194/2632
1361/3000
1696/3740
1819/4010
2023/4460
3506/7730
2944/6490
2381/5250
---
----
8245/18176
7330/16160
5988/13200
5443/12000
4581/10100
3974/8760
----
----
----
3107/6850
---
1050/42
1200/48
---
---
---
---
1500/60
1800/72
457/18
610/24
915/36
1219/48
610/24
915/36
1219/48
1524/60
1829/72
1524/60
1829/72
1524/60
1219/48
915/36
610/24
----
8573/18900
9798/21600
12247/27000
10977/24200
15060/33200
9616/21200
13608/30000
12338/27200
----
----
----
----
----
----
----
----
----
----
----
---
---
2100/84
2400/96
---
---
---
---
---
---
---
---
---
---
3000/120
3600/144
1829/72
1524/60
1219/48
1219/48
2438/96
1524/60
2438/96
1829/72
-------
(metric/imperial)
STANDARD BASE SECTIONS1050 to 3600 mm DIAMETER42 to 144 in. DIAMETER
M18
SIZES AVAILABLE
SIZES AVAILABLE
114
114
114
152
127
203
177
446
774
1071
1361
2008
2828
3720
229
298
330
4.5
4.5
4.5
5
6
7
8
9
13
11.75
4762
7813
10343
3200
2500
1900
1350
915
720
520
300
5250
6950
600
750
1050
1800
1200
1500
2100
2400
3000
3600
24
30
42
48
60
72
84
96
120
144
WALLMASS
LAIDHEIGHT
kg/m2134 2438 THICKNESS
WALLlbs./footWEIGHT
9684 THICKNESS
HEIGHTS
(Metric) mm
15241219915305 610
SECTIONDIAMETER
6048
(Imperial) in.
HEIGHTS
3612 24
SECTIONDIAMETER
1829
72
INTERMEDIATE SECTIONS
INTERMEDIATE SECTIONS
STANDARD INTERMEDIATE SECTIONS600 to 3600 mm DIAMETER24 to 144 in. DIAMETER
M19
WALLL
AID
HE
IGH
T
816
1542
610
114
4.5
816
1088
1088
915
1800
2400
1800
3400
24
36
48
48
240048
1200 to 750
1200 to 1050
EC2
EC1
1050 to 750
1050 to 750
1050 to 600
42 to 30
42 to 30
48 to 30
48 to 42
EC3
EC4
EC1
EC3
EC2
42 to 24EC4
1219
1219
1219
THICKNESSWALL
kgMASS
THICKNESSWALL
lbs.WEIGHT
CONEDIAMETERTYPE
CONE
DIAMETERCONECONE
TYPELAID HT.
LAID HT.
(Imperial) in.
(Metric) mmECCENTRIC CONES
ECCENTRIC CONES
STANDARD ECCENTRIC CONES
M20
203/8
203/8
203/8
204/8
152/6
152/6
152/6
305/12
152/6
454/1000
616/1358
1302/2870
1930/4254
3502/7720
2650/5840
113/250
209/460
8321/18345
305/12 11587/25545
LAIDHEIGHT
330/13
267/10.5
267/10.5
324/12.75
330/13
330/13
242/9.5
457/18
242/9.5
2100/84
1800/72
1500/60
1200/48
1050/42
2400/96
750/30
600/24
3000/120
457/183600/144
Special sizes upon request
600mm/24 in.675mm/27 in.750mm/30 in.
OTHER LOCATIONS FOR HOLES AVAILABLE BY REQUEST.STANDARD ACCESS HOLE PATTERNS AS SHOWN ABOVE.
The weights provided are calculated using a 600mm diameter opening.
RECESS OPTIONAL
thicknessCover
OPENING DIAMETERAS REQUIRED
CENTERED OPENING
COVERTHICKNESS
mm/in.
MASS/WEIGHTkg/lbs.
AS REQUIREDOPENING DIAMETER
OFFSET OPENING
LAID HEIGHT
mm/in.
COVERDIAMETER
mm/in.
NOTES:
(Metric / Imperial)COVERS
TOP VIEW
STANDARD OPENINGS:
216/8.5 264/580300/12 750/30
216/8.5 143/315 600/24 300/12
190/7.5 518/1143300/121050/42
190/7.5 704/1552300/121200/48
STANDARD COVERS600 to 3600 mm DIAMETER24 to 144 in. DIAMETER
M21
La
id h
eig
ht
Co
ver
thic
kne
ss
La
id h
eig
ht
by request.
1302/2870
1930/4254
589/1300
616/1358
1930/4254
1302/2870
616/1358
454/1000
1143/2520
above. Other locationspatterns as shown
for holes available
Standard access hole
Co
ver
thic
kne
ss
La
id h
eig
ht
Co
ver
thic
kne
ss
1500/60
1200/48
1050/42
1800/72
1800/72
1500/60
1200/48
1050/42
330/13
267/10.5
267/10.5
324/12.75
330/13
324/12.75
267/10.5
267/10.5
572/22.51050/42
2
2
2
2
1
1
1
1
1
Special sizes upon request
The weights provided are calculated using a 600mm square opening.
203/8
203/8
152/6
152/6
203/8
203/8
152/6
152/6
457/18
OPENING600mm/24" SQUARE
CENTERED OPENING
MASS/WEIGHT
kg/lbs.
CENTERED OPENING
OFFSET OPENING
TWIN 600mm/24"SQUARE OPENING
LAID HEIGHT
(Metric / Imperial)
COVERDIAMETER
mm/in. mm/in.OPENINGS
NUMBEROF
NOTES:
COVERTHICKNESS
mm/in.
COVERS
TOP VIEW
CATCH BASIN COVERS1050 to 1800 mm DIAMETER42 to 72 in. DIAMETER
M22
SLA
B
WALL
LAID
HE
IGH
T
5.00
4.50
7.00
6.00
6.00
6.00
127
114
152
152
152
179
6.0
6.0
8.0
12.0
12.0
12.0
152
152
305
305
203
305
1000
1358
2870
3375
2925
5000
8.00
8.00
8.00
7.00
9.00
9.00
9.00
9.00
11.75
11.75
11.75
11.75
13.00
13.00
13.00
13.00
179
203
203
203
229
229
229
229
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
298
298
298
298
330
330
330
12.0
12.0
12.0
12.0
12.0
12.0
12.0
305
305
305
305
305
305
305
305
5400
6355
7720
7320
7870
9040
10405
10005
305
305
305
305
305
305
305
14975
17110
17510
11950
24310
22175
19150
12.024710 305 330
10.50
10.50
16.75
16.75
12.75
17.00
48 to 30
42 to 30
72 to 48
60 to 48
60 to 42
60 to 30
432
324
425
425
267
267
1800 to 1200
1200 to 750
1500 to 1200
1500 to 1050
1500 to 750
1050 to 750
17.00
17.00
17.00
17.00
17.00
17.00
17.00
17.00
17.00
18.00
18.00
17.00
18.00
18.00
18.00
84 to 48
84 to 42
84 to 60
72 to 42
96 to 72
96 to 60
96 to 48
96 to 42
120 to 96
120 to 42
144 to 96
120 to 48
120 to 72
144 to 48
144 to 72
432
432
432
432
432
457
457
457
432
457
457
432
432
432
432
457144 to 42 18.00
2400 to 1800
2400 to 1500
2400 to 1200
3000 to 2400
2400 to 1050
3000 to 1050
3600 to 2400
3000 to 1200
3000 to 1800
3600 to 1050
3600 to 1200
3600 to 1800
2100 to 1200
2100 to 1050
2100 to 1500
1800 to 1050
4100
3570
4538
5420
4720
8686
7942
7761
6793
11208
10058
11027
3320
3502
2883
2450
2268
616
1327
1531
1302
454
WALL
ImperialMetricImperialLbsTHICKNESS
SLAB
MetricTHICKNESS
Imperial
LAID HT.SLAB
Imperial MetricMetricDIAMETER
(Metric / Imperial) mm / in.
MASS/WEIGHT
Kg
REDUCING SLABS
STANDARD REDUCING SLABS750 to 3600 mm DIAMETER30 to 144 in. DIAMETER
M23
34
204
102
113
57
52
170
227
64
127
170
227
113
114
114
114
114
114
114
50
152
305
76
152
76
114
114
114
114
114
114
114
229
305
76
152
229
305
152
838
915
915
838
838
838
675
600
991
991
915
915
750
Nova Scotia only
838 x 838
838 x 838
838 x 838
75
115
450
225
250
375
140
500
280
250
500
375
125
4.5
4.5
4.5
4.5
2
3
12
6
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
6
9
3
12
6
6
12
9
4.5 3
33
33
33
3324
36
36
36
39
39
27
30
36
33 x 33
33 x 33
33 x 33
750mm/30 in.
600mm/24 in.
675mm/27 in.
B
A
B
A
610 x 610 / 24" x 24"
610 x 610
24 x 24
kgMASS
BALAID HT.OUTSIDE
DIAMETER
(Metric) mm
WALL THK.
lbs.WEIGHT
BALAID HT.
(Imperial) in.
OUTSIDEDIAMETER
WALL THK.
*
*
STANDARD OPENINGS
*
STANDARD OPENING
GRADE RINGDIA. / SIZE
GRADE RINGDIA. / SIZE
TOP VIEW
ROUND GRADE RINGS
SQUARE GRADE RINGS
GRADE RINGS
GRADE RINGS
New Brunswick only+
***
***
+ 154152152991
***
Nova Scotia only* New Brunswick only+
***
+ 3406639
STANDARD GRADE RINGS600 to 750 mm DIAMETER and 610 x 610 mm SQUARE24 to 30 in. DIAMETER and 24 x 24 in. SQUARE
M24
96 in.
7.5
in.
19
1m
m
6 in
.
15
2m
m
BASE
OPTIONALSUPPORT
SINGLEOFFSETJOINT
1397 or 1575mm SQUARE
AS REQUIRED
2438mm
42 or 48 in. SHAFTING1050 or 1200mm SHAFTING
750 to 3600mm
See manhole assembly chart page M17
30 to 144 in.
55 or 62 in. SQUARE
NOTE:
TOP VIEW
MANHOLE TEE BASE750 to 3600 mm DIAMETER30 to 144 in. DIAMETER
M25
NOTE:
1050 or 1200mm SHAFTING42 or 48 in. SHAFTING
102mm MINIMUM
AS REQUIRED
750 to 3600mm
SINGLEOFFSETJOINT
152m
m19
1mm
OPTIONALSUPPORTBASE
See manhole assembly chart page M17
30 to 144 in.4 in. MINIMUM
6 in
.7.
5 in
.
TOP VIEW
MANHOLE TEE BASE BEND750 to 3600 mm DIAMETER30 to 144 mm DIAMETER
M26
PVCT-JUNCTION
PVC180 /DEAD END
PVC90 BEND
LAID HEIGHToo
(Metric / Imperial)
DIAMETERMANHOLE
mm/in. mm/in. mm/in. mm/in. mm/in.
BENCHING
SINGLE OFFSET JOINT
CAST-IN GASKET
BENCHING
610m
m (
24 in
.)
1219
mm
(48
in.)
2% GRADE ACROSS MANHOLE
203/8 203/8 203/8
1050/42 -- 254/10 254/10
305/12305/12 --
-- -- 305/12
254/10 -- --
1200/48
203/8 -- --
457/18
381/15
-- --
-- -- 915/36 and
915/36 and
610/24 and
610/24 and
610/24 and
610/24
610/24
610/24
1219/48
1219/48
1219/48
1219/48
1219/48
T-JUNCTION
90 BEND
180 or
o
DEAD END
oNOTE:
BENCHING
MANHOLE BENCHING WITH GASKETSStandard configurations - Available from stock
* The minimum concrete required between pipe openings in all directions = 150mm / 6 in.- See page M17 for base units, M18 for intermediate sections and page M26 for benching and gaskets.
MAXIMUM PIPE SIZES FOR MANHOLES1050 to 3600 mm DIAMETER42 to 144 in. DIAMETER
M28
CAST IRON FRAMEAND COVER.
EC2, EC3 AND EC4ECCENTRIC CONES
INTERMEDIATE SECTION
INTERMEDIATE SECTION
COVER
GRADE RING
SEE JOINT SEALS PAGE M29
SINGLE OFFSET JOINT DETAIL600 / 24 and 750 mm / 30 in. DIAMETER
M29
NOTES:
1) The BELL and SPIGOT must be cleaned andlubricated, if required, prior to assembling each unit.
2) The SINGLE OFFSET GASKET must be placed as permanufacturer’s recommendations around the spigotend of the pipe. The gasket must be placed tight to thespigot shoulder. (See pages P11 and P12)
3) Each unit must be placed squarely on top of the otherto prevent the gasket from unseating itself anddamaging the unit.
NOTE: From time to time we may have to revert back to our old gasket system to meet supply anddemand conditions (see page P13).
SINGLEOFFSETGASKET
BUTYLSEALANT
SINGLEOFFSETGASKET
AND BUTYLSEALANT
CONFINED "O"-RINGDETAIL
STANDARD MANHOLE JOINT SEALSManholes, sewage lift stations, catchbasins and valve chambers
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