Ozone and Pure Oxygen Diffusers-{Twin Pack}-Manufactured by Bubblemac Industries, Inc. Makers of The Forever Bubble Stone - 100% Glass-Bonded Silica Air Diffusers Model #1111FK-2 Bubblemac Ozone / Pure Oxygen Diffusers are constructed of high-quality 100% glass-bonded silica and come complete with KYNAR 5/32" air line connection fittings. {Kynar is compatible with corrosive gases} -- {TWIN-PACK} These diffusers are time-tested and have proven outstanding performance in hatcheries and labs worldwide for the past 30 years. -- These speciaized diffusers are designed to provide "Efficient" Delivery of Oxygen and Ozone and will replace the cheap import diffusers supplied with the following manufacturers designs: {A2Z Aqua6, MP3000, MP5000, MP8000}, {Signstek-400mg/h and 500mg/h}, {O3-Fruit and Vege Washer}, {ENALY - OZX-300AT, OZAC-Plus-200mg/h, 500mg/h and ZO-30N}. As well as other models not listed. Replace your ozone diffuser with a diffuser that is actually designed to handle the strongest concentrations of ozone, and guaranteed to do so time and time again. These diffusers measure .5" x .5" X 1.5". BUBBLEMAC manufactures Oxygen / Ozone Diffusers in many different sizes with a selection of fittings {Stainless Steel, CPVC, Kynar} ALL of which are compatible with corrosive compressed gases. See the pictures for examples. An excellent choice for aeration deployment, in any eco-system that requires enriched environments {i.e.- bacteria growth}