Experience ultimate comfort with the ultra-thick tempered glass that provides insulation, keeping your RV warm in the winter and cool in the summer. Upgrade your RV with the RV Vertical Slide Window 18"W x 24"H - the must-have vertical sliding window for campers seeking both functionality and style. Crafted with quality and safety in mind, this window is proudly made in China and carries DOT certification. Rest assured, the high sealability of this window prevents any water leakage, keeping your RV dry and cozy in any weather. NOTE: Please check the picture carefully before purchase, and check the product description for the specific model.