The fine adjusting valve is used for adjust the amount of carbon dioxide finely, this valve with high adjustment fineness, there is no air leakage under the high pressure system. Single head and double head optional, keeping your aquatic plants healthy, more convenient and save energy. Features: DURABLE AND EASY TO INSTALL: Be made of aluminum alloy and copper material, strong and sturdy. Also, easy to install and disassemble. FINE-TUNING THE VOLUME OF CO2: With precise structure, to release CO2 by fine tuning, so that better supply suitable CO2 for water plants. 2 TYPE OPTIONAL: Single head fine adjusting valve one end fits for G1/8 interface, the other end connect to the 6*4mm(inner diameter 4mm,outer diameter 6mm) air pipe, the nut is for fixing the air pipe prevent the air pipe from collapsing; Double head fine adjusting valve 2 end fit for the 4*6mm pipe (inner diameter 4mm and outer diameter 6mm), the nuts are for fixing the air pipe prevent the air pipe from collapsing. FINE WORKMANSHIP: This item is different from the cheap plastic fine adjusting valve, the adjustment fineness is high, and there is no air leakage under the high pressure system. WORRY FREE WARRANTY: Any problem, please contact our store without hesitation. Honor to serve you! Specification: Name: Fine adjusting valve Color: Silver Main material: Aluminum alloy+copper Optional type: Single head/double head Size: Single head: 38*29mm Double head: 43*29mm Package Information: Package size: 12.3*7.9*3cm Package weight: 55g; 59g Plastic Packaging Package List: 1* Fine adjusting valve