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Step 3: Attach the connectors to the barrel

Picture of Attach the connectors to the barrel
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From the inside thread the connector that has the male threads through the hole until it contacts the wall of the barrel.

From the outside, thread the extension connector to the connector that is threaded through the barrel.  Hand tighten until it is snug.  The water flowing through the overflow connection will not be under pressure and if it leaks at all, it won't be much.