T Type Round Silicone Rubber Stopper end cap rubber tube plug with 3.75mm hole for 10mm 10 mm hole 10.6mm 25/64" 13/32" Diameter - AliExpress Computer & Office
Spot Supplies 9.5mm 10mm 10.0mm 9.5 10 10.5 Mm Hole Transparent Black Soft Rubber Plug For Water Proof Door Cover Gasket Stopper - Gaskets - AliExpress
10mm Hole T Shape Silicone Stock Seal Plug Silicone Rubber Plug - Buy Silicone Stopper,Rubber Plug,Silicone Plug Product on Alibaba.com
Rubber plug 10mm black
Amazon.com: Floor Jack Rubber Plug for Filler Hole, 3 Piece Set, 8mm, 10mm, 8mm-Large, Quality Replacement Parts for Repairs : Automotive