Check the listing for details. 40 Pcs 8 Sizes Silicone Rubber Stoppers High Temp Protective Tapered Plug. Condition: New. Listed at 12.81 USD. Pink Silicone Rubber Tapered Plug, Black Silicone Rubber Tapered Plug, Red Silicone Rubber Tapered Plug, Yellow Silicone Rubber Tapered Plug, and Blue Silicone Rubber Tapered Plug for blocking transmission, brake, vacuum pipelines, and ports in chemicals, machinery, construction, or laboratories.