Overview The OASITek Underdeck Wall Channel Inside Corner Box is designed to connect two wall channel runs at an interior 90° corner. It provides a clean, aligned transition where back wall channels meet inside corners while maintaining proper drainage performance. Used at interior wall intersections, this component ensures continuous water flow and a finished, professional appearance at perimeter transitions. Sold individually. Why You'll Love It - Connects wall channels at interior 90° corners - Maintains proper alignment and uninterrupted drainage - Creates a clean, finished inside corner detail - Designed specifically for OASITek underdeck systems - Preserves the professional look of the perimeter finish What's Included - One (1) Underdeck Wall Channel Inside Corner Box Helpful Notes - Inside corner boxes are required where two wall channel runs meet at an interior 90° corner. - Outside corner boxes are used when wall channels transition around an exterior 90° corner. - Straight joints are used to connect two wall channel sections in a straight, continuous run. 👉 View Outside Corner Box👉 View Straight Joint