This is an auxiliary pump selector valve used in commercial aircraft. This one has a serviceable tag from Flying Tiger Line dated 8/10/74 and has been in storage since. It is in very good condition without damage to the housing or ports. The mounts are also undamaged and it is listed as part number 3652374-5001. Unfortunately I have no way to test it so listing it AS IS. Thank you for looking and please see our many other aviation auctions.