Review on JW Pet AccuAir Gang Valve - 4-Way: Optimize Your Aquarium's Aeration Control by Jean Ohm

Bought four of these. One was already broken when I pulled the air hose off one of the nipples. No big deal because I just closed this line forever. They all seem to have small air leaks where the yellow plastic screw goes through the black washer in the valve. I have to adjust them from time to time because the airflow changes. I'm not very impressed with them, but they were cheap. Sorry seller and manufacturer for this review. But I still use them. January 2015 update, Revain has asked me if I would like to buy this product again. No way! EVERY one of the four I bought broke. They break at the base of the transparent nipple where the airline connects. And don't even think about removing the air hose while it's on. I can guarantee it will break there. I would look at another product. This costs no money.