|Cretex Manhole Chimney Seals stop manhole frame-chimney inflow. The standard 8 inch Internal Seal (pictured) is double pleated. It is furnished with two expansion bands and will cover 0" to 4 1/2" of grade ring height. The 10 inch WIDE Internal Seal is triple pleated. It is furnished with two expansion bands and will cover 4" to 7" of grade ring height. The EXTRA-WIDE internal seal has four pleats to provide for a minimum 2 inch vertical and/or 1/2 inch horizontal movement before stretching the material. It is furnished with three expansion bands and will cover 6" to 12" of grade ring height.
|The Internal 7 and 10 inch wide rubber extensions are made from the same material and have the same thickness as our internal sleeves. The top portion of the extension fits into the lower band recess of our internal chimney seal, under the lower band of the seal. Each are provided with one expansion band.