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Buy our 3-1/2" Groove Diameter Rubber Grommets (Fits 3-1/2" Panel Holes). Can be used to seal holes, on pvc pipe, protect wire from sharp objects,reinforce walls, and many other uses.
3-1/2" Groove Diameter Rubber Grommets (Fits 3-1/2" Panel Holes)

3" Inside Diameter Rubber Grommet - 3/16" Groove Width - Fits 3-1/2" Holes
$4.50
3" Inside Diameter Rubber Grommet - 3/16" Groove Width - Fits 3-1/2" Hole.Specs:Inside Diameter: 3"Groove Width: 3/16"Groove Diameter: 3-1/2"Outside Diameter: 4"Thickness: 5/8"Can be used to seal holes, on pvc pipes, protect wires from sharp objects and many other uses. Durometer hardness - 60 Can be used indoors or outdoors.

3" Inside Diameter Rubber Grommet - 1/4" Groove Width - Fits 3-1/2" Holes
$3.99
3" Inside Diameter Rubber Grommet - 1/4" Groove Width - Fits 3-1/2" Hole.Specs:Inside Diameter: 3"Groove Width: 1/4"Groove Diameter: 3-1/2"Outside Diameter: 4"Thickness: 11/16"Can be used to seal holes, on pvc pipes, protect wires from sharp objects and many other uses. Durometer hardness - 60 Can be used indoors or outdoors.

3" Inside Diameter Rubber Grommet - 5/16" Groove Width - Fits 3-1/2" Holes
$3.99
3" Inside Diameter Rubber Grommet - 5/16" Groove Width - Fits 3-1/2" Hole.Specs:Inside Diameter: 3"Groove Width: 5/16"Groove Diameter: 3-1/2"Outside Diameter: 4"Thickness: 11/16"Can be used to seal holes, on pvc pipes, protect wires from sharp objects and many other uses. Durometer hardness - 60 Can be used indoors or outdoors.