Product Description 
This vacuum chamber setup was designed and 100% tested in Naperville, Illinois. With our unique patent pending gasket design (Patent #9475627), this chamber will last 10,000 uses with proper care and maintenance. The gasket itself is reversible (doubling the life of our system), allowing customers to flip it over instantly. Every chamber is tested before shipping to lose no more than 2.5Hg/24hrs.  

Please Refer to these charts for vacuum specifications at altitude and conversions.
High Strength Stainless Steel Chamber
Are assembled and tested in the USA
Highly Durable and Reversible Silicone Gasket