Technical Specifications:Color: WhiteMaterial: ABS and MetalTube Inner Size: 4mm Features and Benefits:▶ Easy to set up▶ CO2 system is designed for low cost planted tank use.▶ 2 air-pipe locks on the bottle cap, prevent the air-pipe get loose▶ ABS bottle caps, good pressure resistance, NO deformation▶ Specialized pressure gauge, build-in automatic safe valve,Keeps pressure in the safe level, never breaks the bottle What do you need to prepare for this systems?below(not included)2x 2 Litre of Coka Cola plastic bottle1x 200g of Citric acid or 200ml of vinegar1x 200g of baking soda Tips to install:the bottle must be carbonated beverage bottle, do not use pulpy, green tea, mineral water bottles, etc.trimming valve regulation avoid by sudden big or small, can't suddenly turn up, after immediately shut down again, so as not to cause abnormal pressure to the bottle.Note: Make sure carefully observe the direction of the parts before assembly. The usual wrong handle way will cause abnormal reaction components as follow: the contrary direction of the check valve and fine-tuning in the direct.

Package Contents:1 x needle valve1 x pressure gauge2 x bottle caps1x English User Manual