Yes, the way its plumbed is that it directly gets pumped back to the tank. The lid is kept in place by 2 sets of clamps which are attached to 2 metal brackets. They are arranged to form an X when looking from the top. There is wood and foam underneath it (directly above the lid, below the X) that spreads the pressure evenly. The lid and makeshift bulkheads are sealed with silicon, both inside and out.
So far its been holding great without a single problem.
Hope I didn't miss anything
HTH
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