I needed a relatively low pressure "air" tank. The 2 liter tank is perfect for my needs. But check the size you need. I was impressed with the tank's adaptability. Plenty of ports (make sure the port size suits your needs). I can adapt the tank to a variety of different fittings and hoses. Get the adapters you think you need, then buy a few more. I can't speak to the use of letterpress, so see other people's comments. But great for my needs. His adaptability has saved me several times.