[FUNCTION] Use this Bumper Cap Cover to prevent the sewer hose from off the bumper while the RV is in motion and being dragged causing damage. [PROFESSIONAL DESIGN] Safety pin prevents the cover from opening while the RV is in motion, avoiding the dump hose to fall out of the bumper. Small vent holes provide airflow and double as an insect screen. [EASY INSTALLATION] Snap the bumper caps onto the ends of the RV bumper, tighten the screws, then insert the pins to complete the installation, and pull out the pins when you need to open them. You can attach the matching non-slip rubber pads to the inside of the cover bezel to make the installation fit better before using. [ MATERIAL] Iron Bumper Plug End Caps are more than hard plastic covers, as well as being a more snug fit. [UNIVERSAL FIT] Square bumper end cap fits on of most metal 4 inch square bumpers and conceal sewer hoses. Color: Black Material: Metal Package Contents: 2 * Protective cover 2 * screw lock 4 * adhesive tape Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.