As an Amazon Associate, we earn from qualifying purchases. Standard Plumbing Supply - Product: 13X24 CONCRETE EXTENSION BOX OLDCASTLE PRECAST INC. . B30EXT Gallery Attributes Brand name, Manufacturer name, ManufacturerOLDCASTLE PRECAST INC. Extra Product NameStandard Plumbing Supply - Product: 13X24 CONCRETE EXTENSION BOX jsonUrlData1485563 moq, multiple, tierMinQty11 MPN, SKUB30EXT qtyInStock0 tierPrice155.67 Distributor offers SellerSKUMOQIn stockMultiplePrices standardplumbing.comB30EXT111 @ $55.67