My new 25 gallon autoclave arrived timely, but I wasn't available to test it until today and I ran into problems trying to get the pressure up to 121. I called customer service and Nicholas responded within a few minutes wait time and walked me through the process. I needed to make sure the air vent was down to get the pressure up. Working with a steamer is new to me and I was nervous about buying one in the first place, but feel pretty good now. As you might see in the photo, the pressure is at 121 and I had two minutes left to go. Thank you Nicholad for your patient help.