NDS diving regulator, Polesther 2. Includes instruction manual. With replaced parts. Total usage approximately 20 times. Overhauled and parts replaced about 2 years ago, used a few times and then stored. Internal photos taken for the listing. The inside is very clean. Assembled and locked after the photos were taken. Confirmed connection to a tank, and there are no current operational issues. I do not guarantee its use. Offered at a low price, so please inspect it before use.