25.4 (1 inch) Hole Plugs for Colder Cooler Project and Other Uses

thingiverse

I'm looking for flexible hole plugs that fit snugly into 1 inch, or 25mm, holes without requiring any glue. These plugs are designed to accommodate different material thicknesses, including 1.5mm, 2.0 mm, 2.5 mm, 3 mm, 3.5 mm, and 4 mm, as some coolers have varying levels of insulation in different areas. The goal is to insulate the lids on my non-marine coolers, which currently lack this feature. By doing so, I aim to keep the contents colder for a longer period. To achieve this, I've been cutting 1 inch holes into the cooler lids and then spray foaming the interiors before inserting these flexible plugs.