Knockout Boxes

Foley Products Company offers a variety of standard knockout box sizes; however, knockout panels can be added to any square vault.  Knockout panels offer the following benefits:

  • Knockout panels allow contractors to make any necessary field adjustments.
  • Future lines can be added as required.
  • Knockout boxes are designed for HL 93 loading

Knockout Boxes Cut-Sheets


  • Storm Sewer
  • Custom Applications


Key Specifications:       

  • ASTM C858 – Standard Specification for Underground Precast Concrete Utility Structures
  • ASTM C913 – Standard Specification for Precast Concrete Water and Wastewater Structures