I give it 3 stars because although the rubber seems durable and is of normal thickness there is a noticeable odor that doesn't dissipate , when it is cleaned . For the price at the time of writing ($100 for $6.99), I'd say the Gateway jacks are worth it. For the price, I can live with a weird smell. The 1/2" spade hole is perfect for this hub. Also fits my bubblers I got from Amazon (Twin Bubble Airlock and Carboy Bung (2 pack))
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