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Materials and
Design
The insert
and components shall be manufactured of materials resistant to corrosion
from atmospheres containing hydrogen sulfide and dilute sulfuric acid.
The Insert
The insert body shall be manufactured of 304 Stainless Steel with a thickness of not less than 18 gauge. The insert shall have a deep-dish bowl design to allow for easy removal of the manhole cover. The insert shall be designed to provide a sufficiently loose fit into the manhole frame to allow easy removal.
The Gasket
The gasket shall be made of closed cell neoprene and shall have a pressure-sensitive adhesive on one side. The gasket shall have a minimum total thickness of 1/8 inch. The gasket is to be installed by the manufacturer.
The Handle
The insert shall have a handle made of 1" heavy weight polypropylene strap installed with stainless steel pop rivet(s) for ease of removal and installation.
Product Disclaimer
InflowShield® durable stainless steel manhole cover inserts are not designed, nor intended for use under the following circumstances: (A) The insert used as a substitute or replacement manhole cover device, (B) The insert used as a means of impeding manhole entry, (C) The insert used as a stand-alone load bearing surface for traffic or pedestrians, (D) The insert has been used for any purpose other than that for which it has been specifically designed.
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