Manhole Adjusting Rings

Neenah Foundry offers a variety of cast iron manhole adjusting rings. Select from the list below to find the manhole adjusting rings that fit your needs.

Cutaway View of Adjusting Ring Installation

Adjusting Ring Installed

R-1979 Series Manhole Adjusting Rings+

R-1979 Series

Manhole Adjusting Rings

Heavy Duty

R-1979 Series Manhole Adjusting Rings

For raising manhole covers when pavement is resurfaced.

Adjusting rings (or extension rings, as they are sometimes called) eliminate the necessity of raising or replacing existing manhole frames on resurfacing projects. The cover recess is the same depth and diameter as the existing manhole frame. Amount of raise coincides with thickness of resurfacing material, thereby bringing the manhole lid to new position flush with refinished roadway surfaces.

Manhole adjusting rings can be placed rapidly and are a permanent installation. Use of adjusting rings may reduce raising costs to as little as 20% of digging up the old manhole frame and resetting it to a new grade.

CAUTION WHEN ORDERING

Be sure existing lid diameters are smaller than "AA" dimension in table. "AA" dimension in table is opening size in extension ring. Lid should measure 1/4" to 3/8" less in diameter than this dimension.

* Adjusting ring is for Non-Rocking applications ** Gasketed for self-seal application *** Ring furnished in ductile iron ≠ 5 degree draft ¥ 10 degree draft § for R-1750-B only

Ref. Number A-A B-B F Rise
1913-7100 7 5/8 2 2 7/8 1
1913-7150 7 5/8 2 3 3/8 1 1/2
1979-0245 9 5/16 5/8 2 1/8 1 1/2
1979-0246 9 5/16 5/8 2 5/8 2
1979-0166 18 3/8 1 3 1 15/16
1979-0167 18 3/8 1 4 2 15/16
1979-0008 21 1/2 1 3 2
1979-0115 21 1/2 1 3 1/2 2 1/2
1979-0022 21 1/2 1 4 3
1915-7200 ** 21 3/4 1 2 31/32 2
1692-7200 21 7/8 1 1/4 3 1/8 2
1979-0223 22 1/8 1 1/8 3 1/8 2
1500-7200 22 1/4 1 1/2 3 1/2 2
1979-0035 * 22 1/4 1 1/2 3 1/2 2
1500-7250 22 1/4 1 1/2 4 2 1/2
1979-0036 * 22 1/4 1 1/2 4 2 1/2
1500-7300 22 1/4 1 1/2 4 1/2 3
1979-0119 * 22 1/4 1 1/2 4 1/2 3
1979-0270 * 22 5/16 1 1/2 3 1 1/2
1979-0258 22 3/8 1 3 2
1762-7150 22 1/2 1 2 1/2 1 1/2
1979-0215 22 1/2 1 5 4
1979-0034 22 1/2 1 1/2 3 1/2 2
1979-0116 22 1/2 1 1/2 4 1/2 3
1979-0047 22 3/4 1 1/2 3 1/2 2
1979-0131 22 3/4 1 1/2 4 2 1/2
1979-0019 22 3/4 1 1/2 4 1/2 3
1580-7150 * 22 3/4 1 3/4 3 1/4 1 1/2
1979-0129 * 22 3/4 1 3/4 3 3/4 2
1979-0170 * 22 3/4 1 3/4 4 3/4 3
2424-7200 22 3/4 2 5/8 4 5/8 2
1661-7100 22 7/8 1 1/2 2 1/2 1
1661-7158 *** 22 7/8 1 1/2 3 1/8 1 9/16
1661-7200 23 1 1/2 3 1/2 2
1979-0004 23 1 1/2 4 2 1/2
1979-0005 23 1 1/2 4 1/2 3
1713-7101 23 1 3/4 2 3/4 1
1713-7150 23 1 3/4 3 1/4 1 1/2
1713-7200 23 1 3/4 3 3/4 2
1979-0177 23 1 3/4 4 2 3/16
1713-7250 23 1 3/4 4 2 1/2
1713-7300 23 1 3/4 4 3/4 2 15/16
1715-7176 23 1/16 1 3/4 3 1/2 1 3/4
1979-0139 * 23 1/8 1 3/4 4 1/4 2 1/2
1979-0146 * 23 1/8 1 3/4 4 3/4 3
1979-0023 * 23 7/32 1 1/2 4 1/2 3
1550-7150 23 1/4 1 1/2 3 1 1/2
1550-7151 * 23 1/4 1 1/2 3 1 1/2
1550-7200 23 1/4 1 1/2 3 1/2 2
1550-7201 * 23 1/4 1 1/2 3 1/2 2
1979-0010 23 1/4 1 1/2 4 2 1/2
1979-0106 23 1/4 1 1/2 4 1/2 3
1979-0128 * 23 3/8 1 1/2 4 2 1/2
1979-0181 * 23 3/8 1 3/4 3 3/4 2
1979-0006 * 23 7/16 1 1/2 3 1/2 2
1979-0180 23 1/2 1 2 5/8 1 1/2
1797-7300 23 1/2 1 4 3
1979-0024 23 1/2 1 1/2 3 1/2 2
1979-0025 23 1/2 1 1/2 4 2 1/2
1979-0026 23 1/2 1 1/2 4 1/2 3
1979-0275 23 3/4 1 2 5/8 1 5/8
1979-0150 23 3/4 1 3 2
1979-0265 24 1 2 1/2 1 7/16
1979-0253 24 1 2 1/2 1 1/2
0000-0034 24 1 2 9/16 1 1/2
1979-0065 24 1 2 5/8 1 5/8
1979-0264 24 1 3 1 15/16
0000-0545 24 1 3 1/16 2
0000-1309 24 1 3 9/16 2 1/2
0000-0814 24 1 4 1/16 3
1979-0273 24 1 4 1/4 2 1/2
1979-0254 24 1 4 1/2 2
1979-0012 24 1 1/2 3 1/2 2
1979-0042 * 24 1 1/2 3 1/2 2
1979-0046 24 1 3/4 4 1/4 2 1/2
1979-0044 24 1 3/4 4 3/4 3
1979-0145 24 3/16 1 1/8 2 9/16 1 7/16
1979-0143 24 1/4 1 3 2
1979-0033 24 1/2 1 1/2 3 1/2 2
1979-0040 24 1/2 1 3/4 4 1/4 2 1/2
1979-0041 24 1/2 1 3/4 4 3/4 3
1767-7100 25 1 2 1
1979-0160 25 1 2 1/2 1 1/2
1979-0171 25 1 3 2
1979-0272 25 1 3 1/2 2
1979-0058 25 1 1/2 3 1/2 2
1979-0134 25 1 3/4 4 1/4 2 1/2
1979-0144 25 1 3/4 4 3/4 3
1979-0271 * 25 5/16 1 1/2 3 1 1/2
1979-0266 25 1/2 1 1/4 3 1/2 2
1979-0158 25 1/2 1 1/4 3 3/4 2 3/8
1979-0037 25 1/2 1 1/2 3 1/2 2
1979-0118 * 25 1/2 1 1/2 3 3/4 2
1979-0117 * 25 1/2 1 1/2 4 3/4 3
1979-0137 25 1/2 1 3/4 4 1/4 2 1/2
1979-0124 25 1/2 1 3/4 4 3/4 3
1979-0074 25 7/8 7/8 3 3/8 2 1/2
1979-0076 25 7/8 7/8 4 3/8 3 1/2
1979-7200 25 15/16 1 3 2
4353-0019 26 7/8 2 3/8 1 1/2
4353-0017 26 7/8 2 7/8 2
4353-0013 26 7/8 3 7/8 3
1979-0278 26 1 2 1
1979-0279 26 1 2 1/2 1 3/8
1979-0280 26 1 3 1 7/8
1979-0055 26 1 3/8 3 3/8 1 15/16
1979-0102 26 1 3/8 3 7/8 2 1/2
1979-0051 26 1 3/8 4 3/8 2 15/16
1979-0176 26 1 1/2 3 1/2 1 15/16
1642-7150 26 1/8 1 1/2 3 1 1/2
1642-7200 26 1/4 1 1/2 3 1/2 2
1642-7250 26 1/4 1 1/2 4 2 1/2
1642-7300 26 1/4 1 1/2 4 1/2 3
1979-0062 27 1 3/8 3 3/8 2
1979-0263 28 1 2 1/2 1 7/16
1979-0250 28 1 3 1 15/16
1979-0251 28 1 4 3
1979-0091 § 28 1/4 1 3 2
1979-7190 28 1/4 1 3/8 3 3/8 1 7/8
1753-7200 29 1 3/8 3 3/8 1 15/16
1979-0054 ¥ 29 1 3/8 3 3/8 1 15/16
1979-0043 29 1 3/8 3 13/16 2 1/2
1979-0015 29 1 3/8 4 3/8 2 15/16
6052-7218 29 3/8 1 3/4 4 2 3/16
6052-7293 29 3/8 1 3/4 4 3/4 2 15/16
1979-0203 30 3/8 1 1/2 4 1/2 3
1743-7200 31 15/16 1 3/4 3 3/4 2
1743-7300 31 15/16 1 3/4 4 3/4 3
1979-0052 32 1 3/8 4 3/8 2 15/16
1743-7150 32 1 3/4 3 1/4 1 1/2
1979-0053 32 1 3/8 3 3/8 1 15/16
1979-0057 33 1/2 1 1/2 3 1/2 1 15/16
1979-0049 33 1/2 1 1/2 4 1/2 2 15/16
1979-0092 35 1/2 2 4 1/2 2 1/2
1979-0268 36 1 1/4 2 1/4 1
1979-0269 36 1 1/4 2 3/4 1 1/2
1979-0056 36 1/2 1 1/2 3 1/2 1 15/16
1979-0050 36 1/2 1 1/2 4 1/2 2 15/16
1979-0093 38 1 1/2 3 1/2 2
1979-0136 38 1/4 1 1/2 3 1/2 2
1742-7200 39 1 3 2
1979-0252 40 1/16 3 4 1/2 3 3/4

Square/Rectangular

Ref. Number A-A B-B F Rise
1978-0022 8 1/8 x 8 1/8 7/8 2 7/8 2
1979-0249 8 1/8 x 8 1/8 7/8 2 1/8 1 1/4
0000-1090 13 3/8 x 19 3/8 1 1/4 3 1/4 2
3278-7225 16 3/4 x 22 1/4 1 3/4 4 2 1/4
0000-1029 19 3/8 x 20 3/8 1 1/4 3 1/4 2
0000-1081 19 3/8 x 19 3/8 1 1/4 3 1/4 2
3278-0015 22 1/4 x 16 15/16 1 3/4 4 1/8 2 1/2
3287-7250 22 3/4 x 45 3/8 2 4 7/16 2 1/2

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All dimensions are listed in inches unless otherwise noted.

To order Neenah Foundry products, please call 800.558.5075.

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Manhole Adjusting Rings

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