These plugs are for a Cessna 182R. They come in the standard safety red with remove before flight tags. Our plugs are made with marine grade materials for durability and longevity. Heater hose hole is a standard 3.5″-4″ opening that can be customized up to 5″ to accommodate other style heaters. All our plugs come with a travel plug for use without the heater hose while you are on the go. Our plugs are a one piece design with a Velcro close out for easy replacement of the foam. These plugs will not push through the cowl opening, as they are made from a durable, water resistant board. This hard shell design is what sets our cowl plugs apart from others on the market. The 32 ounce marine grade vinyl cold crack durable down to -10 degrees Fahrenheit . Cleaning should be done with mild soap and warm water.