Dirty Air When a tank is filled with air, small amounts become liquefied and settle inside the cylinder. Salt, water, rust, silicon residue and aluminum oxide can form inside the tank along with oil and carbon dust. Patented Apollo Clean Air System Inline Attaches directly to first stage LP port Electret Clean Air Filter removes dust, rust and oil mist. Dive tanks can retain small particles of dust rust and oil residue. Inhaling these contaminants can be harmful to your body. Electret clean air cartridge efficiently removes these impurities. Additional Information Nitrox compatible up to EAN level 40 Shock Absorber A little give does a lot to help prevent damage from mishandling. 1st stage connector features ball joint and damper to absorb external impact. This area will always have some movement even after lock down. Includes Bio-Micro, Electret Filter x2, Clamp and Allen Wrench Size 3/8" or 1/2" Material and Color Powder Coated Brass, Silver Dimensions 3/8" 32 x 59.5mm, 1/2" 32x74mm Weight 3/8" 120g, 1/2" 136g Manufactured Japan.