Ultimate Homebrew Oxygenator Kit For Precision Oxygenate with precision Liter-per-minute (1/32 LPM  4 LPM) controllable flow rate regulator Refillable new 20 cu. ft. steel oxygen tank, good for approximately 500 batches 22" stainless wand for precision aeration stone placement No clamps, no parts to rust, and no contamination from your fingers