Concrete Manhole Adapters

Concrete Manhole Adapters

Eliminate leaks around pipes that enter manhole walls.

Concrete Manhole Adapters (CMA’s) are flexible enough to permit lateral pipe movement without destroying seal integrity. It is additionally useful for pipe to which concrete will not adhere, such as plastic pipe.


  • CMA's are subjected to many various conditions that are beyond the manufacturers control, such as high ground water tables, quality of grout, workmanship and field conditions that can affect its sealing ability. Discretion must be used in its application and installation.
  • Due to the varying factors that can influence the CMA's effectiveness as a seal, Fernco does not warrant this product as a positive water seal.


  • Made of elastomeric PVC
  • Corrosion proof and is unaffected by acid or alkali.

Models: Dimensional Range A to B

Part No. Side A Side B
  inches mm inches mm
4CMA 4.50 114 4.22 107
6CMA 6.63 168 6.28 159
8CMA 8.63 219 8.40 213
10CMA 10.75 273 10.50 267
12CMA 12.75 324 12.50 317