Special designed for Planteded Tank, constant pressure design, high precision tuning, easy to realize 1 bubble/3 second Stainless steel material, never rust for 4/6mm air line.<br><br>Provides the convenience in distributing air flow up to different tanks. you can supply Co2 to aquariums, without having to purchase additional Co2 tank! Precisely adjust the rate of air flow. Notice: if Bubble counter need, should order seperately Specification: W02-03 Color: Silver Material: aluminum alloy<br><br>Package Contents: 1 * CO2 pressure reducing gauge<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.