N-Fit Filter Sock Cover

N-Fit 4" Filter Sock Opening Cover M1010 is used to cover unused 4" filter sock openings when an N-Clear M filter is installed in another position.

• Blocks water flow through the unused filter sock opening.
• Diameter: 115 mm / 4.53 in.
• Flexible silicone plugs help anchor the cover, keeping it in place and reducing the chance of it being pushed away by water movement.
• Best for multi-opening sumps or setups where the N-Clear M is installed in one opening and the other opening should be covered.

If you need an adapter for an AIO tank or rectangular filter sock opening, see the N-Fit M Adapter listing.