Brand new Oil X-Change system, Model No. 946D. (See manufacturer's website at www.x-change-r.com). This unit is in the original box, and was never used. Designed with a Triple Port, for 2 Engines+ 1 Generator, or 1 engine+1generator +1transmission, or any other triple combination. 12 volts. Manufacturer's list price $599, and the "Special Pricing" on their internet site is $549. My price is $275, which is very fair at half the internet price, so this is a firm number. Pictures available. Shipping at cost. Inquiries by e-mail (gma4@mac.com) or phone: 631-751-3836