Material: 3.4 stainless steel+aluminium alloy
Type: W21.8 G5/8
Feature: Double bubble counter,could control 2 aquariums
Feature 1: delicate,exquisite and durable
Fit for: Aquarium fish tank
Item: 220V Aquarium CO2 Regulator
Product: Magnetic Solenoid Check Valve Aquarium Bubble Counter