I installed this 5 1/2" hose on my tank just over a month ago. Now only half of the bar produces bubbles. It was great while it lasted, but having to replace it every time I empty my 55-gallon tank makes it too expensive. Will have to look for other brands. Most of the Penn Plax Air Stones I've bought recently just don't last very long. They are made in China so what I bought may be fake or they just don't make good quality anymore. The pet shops around me seem to only sell this brand and I believe another. Not much choice.
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