need something like a manhole cover for a greywater tank

Old 11-11-13, 10:32 AM
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need something like a manhole cover for a greywater tank

We are installing three tanks for a greywater system. Each tank has an interior diameter of 36" and outside of 42". We need covers. I have found manhole covers but they stop at 36". Also of course very expensive. I am trying to figure out what else might work. We just need to be able to lift it (or put an access hole in it), and of course be able to walk on it safely. Does anyone have any ideas as to what might work? I have also wondered if I could get away with something bigger that wasn't round. Thanks for your help!
Old 11-11-13, 10:46 AM
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Make a round form and cast from concrete. Two inches thick and use 1/2 hardware cloth as reinforcing wire. Embed a couple of square "U" handles bent from 3/8" rebar into each one.

Last edited by ray2047; 11-11-13 at 12:50 PM.
Old 11-11-13, 12:41 PM
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Also check with your local septic tank manufacturer. Mine casts square concrete bases with a round plastic riser in the center that accepts a cover. They are used to add lids and risers to septic, and other underground tanks and man ways and they are relatively inexpensive.
Old 11-11-13, 01:15 PM
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The tank manufacturer doesn't have something to put on top of them?

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