Sell Sewer Equipment. Northern Sewer Equipment not only accepts trade-in sewer equipment towards your new, used or remanufactured purchase, but we also purchase sewer equipment of all makes and models outright. Please list your equipment in detail, provide any pertinent or requested information for your free trade in, or outright purchase value. We look forward to hearing you. You can also buy Sewer Equipment for Sale at Northern Sewer Equipment.