A cap provided for use in capping a sewage drain tube of a vehicle and/or opening where a sewage drain tube is located. The sewer drain cap includes a chamber with a lid, useful for storage. Apertures to allow air flow or ventilation and to aid in removal and replacement of the sewer drain cap are provided. A sealing member for the drain tube cap is also provided for attaching to and/or sealing a drain tube and/or opening where a sewage drain tube is located.