Thetford Service Door 6 in Black. Part number: 2686427 Overall dimensions (H × W): 1038 × 465 mm (some sources round to 1039 × 467 mm due to measurement tolerances) Cut-out dimensions (H × W): 997 × 419 mm Clear opening (H × W): 980 × 400 mm Suitable wall thickness: 23–39 mm