As an Amazon Associate, we earn from qualifying purchases. Standard Plumbing Supply - Product: 24X36X10 CONCRETE BOX EXTENSIO OLDCASTLE PRECAST INC. . B40EXT Gallery Attributes Brand name, Manufacturer name, ManufacturerOLDCASTLE PRECAST INC. Extra Product NameStandard Plumbing Supply - Product: 24X36X10 CONCRETE BOX EXTENSIO jsonUrlData1485606 moq, multiple, tierMinQty11 MPN, SKUB40EXT qtyInStock0 tierPrice1148.70 Distributor offers SellerSKUMOQIn stockMultiplePrices standardplumbing.comB40EXT111 @ $148.70