Description: Provides a genuine environment for plants' growing in aquarium using this CO2 generator. Easy to operate and designed for low cost planted tank use, to provide your aquarium plants an abundant CO2 environment for better growing. This CO2 Generator System Kit is with pressure gauge for pressure display, gas adjustable function, and simple pressure relief, easy to operate, safe, and practical. Once start, sustainable gas supply. Made of plastic metal material with a locking pipe device to ensure non-deformation, , non-slip when working. And with professional metal gas adjusting valve to ensure pure CO2 DIY. Make sure carefully observe the direction of the parts before assembly; The usual wrong handle way will cause abnormal reaction components. Specification: Material: Plastic+Metal Size:Approx.175x130x45mm/6.89x5.12x1.77inch Package Includes: 2 Pieces Bottle Caps 1 Piece Pressure Gauge(including pressure relief valve) 1 Piece Fine-tuning Valve 1 Piece On-off Value 1 Piece Suction Tube (including water absorbing ball) 1 Piece Pipe (including tee) 1 Piece Magnet 1 Piece 1.6M 1 Piece Manual Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-3mm differences due to manual measurement.