I have these as a spare along with many others Bought incredibly awful, brittle drain clamps on a Marineland rimless tank. They work great for a 90 gallon cube but as mentioned they attach to the tank itself and hold the lid under the top of the tank as opposed to the standard clamps which attach to the lid and hold the lid over the tank keep. At least they seem to be more durable than standard clamps. Since there are no other real options for changing clamps, they do their job well, but you may need more than four for larger tanks.
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