Why to box covers have holes?

GW111August 29, 2013

Anyone know why irrigation control valve boxes have a hole in the top? I have a few old ones that do not. Anything I find any local stores all have a single hole.

I presume it is for convenience of lifting. I also wonder if it may help reduce moisture.

Regardless of the above, I see dirt drifting down through this opening and don't want it!

What's your opinion?

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duffiecat

Here is my opinion, only because I just posted a question about a control valve box: besides being able to use your finger to open, this hole could be a way for excess water to escape.

One of my boxes keeps filling up with water so this hole could be for overflow?? Again, my opinion only!

    Bookmark   August 29, 2013 at 5:29PM
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lehua49

GW,

Same reason there are holes in a manhole cover. A lever is used in the manhole lid (usually a pick or crow bar). The valve box lid is similar only on a smaller scale. It is for inserting a lever (usually a screwdriver or valve rod) to open the cover when dirt is compacted in the lid edge and the lid is almost impossible to open with a finger. JMHO ALoha

    Bookmark   August 29, 2013 at 7:11PM
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