Ultrapure Oxidizer® Chemical Reduction System®For portable and inground spas. Ozone generators are individually packaged with a 1/4 x 1/4 check valve, 6ft of 1/4"id clear pvc tubing, a 1/4"B x 3/8"thd adapter, (2) 1/4B x 1/4thd adapters, and mounting hardware