Feature 1Application: The bumper plug cap fits for most standard 4in square bumpers, and will conceal sewer hoses while allows air flow for veltilation. 2Function: Cap has square hole in middle for air venting and to use for removing plug, this style bumper plug is used often on RV and trailers. 3Unique Design: The design of the square hole in the middle of the sqaure bumper cap is easy to install and remove, makes it practical in use and function. 4Durable Material: Made of high strength ABS plastic material, which is impact resistant, wear proof, anti aging, deformation proof and durable. 5Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability.Item Type:RVBumperPlugCapMaterial: ABSFunction: Conceal the sewage hose while the square hole in the middle still allows ventilation .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Design: The design of the square hole in the middle is easy to install and removeFitment:Fits for RVs, campervans, trailers, 4in square bumpersPackage List2 x RVBumperPlugCap