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Knockouts and Custom Holes

Any Concast H20 rated handhole can be cast with holes or knockouts.  It is recommended to use oversize openings to ensure a proper fit.  Holes can then be later sealed.

Knockouts are a great option when you will need an opening at a later date.  A thin concrete shell approximately 3/8" thick seals the knockout opening; keeping out the backfill from your box.  When you are ready to use the opening, the protective shell can be knocked out with a hammer. 

We can also cast in one of our plastic Con-Duct terminators for a temporarily sealed opening that can also be knocked out when it's needed.





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