When you install the solar panel cable on your RV or boat? You need to make a cut in the roof of the RV. To avoid making unsightly and potentially leaky cable entries, use the Haoguo Solar Cable Entry Gland to cover the area, making it fully waterproof.Installation steps:1. Peel off the surface of the 3M waterproof tape at the bottom of the lower cover2. Stick to the roof and fixed with screws3. Peel the surface of the bottom 3M waterproof tape, pass the cable through the gland and pull it into the RV interior4. Press the upper and lower covers together and secure them together by the buckle between them.Specification:Color: WhiteSize: 4.4*3.6*1.57 inchBottom cover size: 3.3*2.5*0.1 inchMaterial: ABS plasticSuitable for: All Cable Types 2mm² to 6mm²