Limited Use Foam Hole-Formers


  • Great for Limited-Run Productions
  • Low-Cost Hole-Former / Knockout Alternative
  • Available in Flat Wall, Clyindrical Wall, Full Sheets
  • Mounting Magnets Available

18″ dia. Parallel Foam Hole for 6″ Wall x 60″ I.D.
(Functional for VORTEX manholes)

64″ dia. Foam Hole for 9″ Wall x 96″ I.D.
(Custom cut for Split-Barrel Application)

2″ PVC and 4″ PVC Septi-Seal Gaskets on “Ready-To-Pour” Foam Mandrels

89″ dia. hole in a 96″ I.D. manhole base

Created with a Foam Hole-Former made by Blackthorn!

CUSTOM 92″ Offset Corner Foam Hole-Former (on pallet ready to ship)

Challenge: Needed a One-Time Use Mold for the base of a column

Solution: Mold made of Multi-layered Foam