3/4" Snap-In Knock Out Seal, Zinc Plated

1" Snap-In Knock Out Seal, Zinc Plated

1-1/4" Snap-In Knock Out Seal, Zinc Plated

1-1/2" Snap-In Knock Out Seal, Zinc Plated

2" Snap-In Knock Out Seal, Zinc Plated

1/2" 3-Piece Knock Out Seal, Pre-Galvanized