Best Seller | Specialty Recreation N1518 Inner Garnish Dome With No Window - 15 x 18 White Specialty Recreation s Inner Garnish Dome with no window is a white thermoformed polycarbonate inner skylight for RVs. The hole dimensions of this inner skylight are 15 x 18 . The flange dimensions are 17 x 20 . The bubble height is about 4 . more | | $89.84 $81.34 FREE shipping go to store |