Used to mask threaded or non-threaded holes and on grounding areas, Harman Corp can make silicone cone plugs in any size, shape, or color.
High Temp Silicone Rubber Plug Assortment Kit for Cerakote
123PCS RUBBER PLUGS for Holes Assorted Sizes,Silicone Plug Kit
High Temp Silicone Rubber Tapered Plug For Masking Off Holes
Silicone Tapered Flange Plugs
Masking - A quick buyer's guide
Black Transparent Conical Taper High Temp Silicone Rubber Powder Coating Plugs Masking Blanking Hole Plug End Cap Stopper Seals - AliExpress
PROSICON EPS 650 High Temperature Masking Silicone Washer Caps
Conical plug - EPS 225 series - PROTEC - non-threaded / silicone
EPDM Tapered Plugs
High Temperature Caps & Plugs for Masking, Buy Online
IMXMI 105Pcs High Temp Silicone Rubber Tapered Plug Kit, Masking
Accessories Silicone Cone Plugs Assortment Kit Masking Plugs
M4 M5 M6 M8 M10 Masking Plug Stopper Silicone Rubber
Tapered Hollow Silicone Plug for Product Masking Applications
Masking - A quick buyer's guide