Aquarium CO2 Check Valve, Stainless Steel Needle Check Valve Bubble Counter Aquariums System CO2 Regulator Fish Tank Accessory(Dual Head Micro metering Valve Bubble Counter)

It works, but be careful and check the Amazon envelope for both parts as they are not housed in one box together. The valve is packaged loosely so one star is deducted for that as it can accidentally get thrown out with the bag