Lee's Knockout Plugs Uplift Tube Caps Black Replacement.

UPC: 010838130305

Vendor: LEE'S

• If you punch out too many knockouts on the under gravel filter, it will not function correctly.
• Knockout plugs snap into the holes to cover them, restoring an otherwise inoperative filter plate. 
• Fits Lee's Original and Economy Under Gravel Filters.