Rubber seal protects against the elements. Will not shatter or corrode. This bright red high-visibility 9kg transport box will securely hold one standard 9kg or 12kg fire extinguisher. Recommended installation is angled at 30 or 60 degrees. Truck box mounting kit is sold separately. See below for link to product detail. Exterior dimensions are 750mm high, 300mm wide and 320mm deep. Interior measures 600mm high, 230mm wide and 230mm deep.