Description The OPW TSM-4536 Medium Bury Polyethylene Tank Sump provides long-term, water-tight performance, strength and rigidity. The one-piece design provides reliable watertight integrity and long product life. Designed to resist deformation under burial and high water table forces. 36 inch manway diameter x 45 inch base. Key Features Installation Flexibility – multiple flats provide maximum area forlocating pipe entries Easy Field Height Adjustability – the special ribbed height adjustment design makes adjustments to finished grade, if necessary, quick and easy. *This product is not eligible for free shipping.