Conical Plug, Ød2.8 to ØD4.7, 10mm Long, Silicone (Milky White), Pack of 10, HBAS47-3-P
SGD $3.00
Conical plugs can be used for a range of hole diameters. Choose one with the right top and bottom diameters to fit the hole size. Simply leave enough length clearance for easy installation and removal.