Flange Vented Plug for M10 to M12 Screw Holes, Ød7.5 to ØD12.5mm, 21mm Long, Silicone (Red), Pack of 500, HBGS1012-B
SGD $396.00
Every flange-vented plug is conical and hollow for a flexible fit. They have an exhaust port to release air expanded by high temperatures. The flange prevents excess paint from adhering to the area around the holes.