Where does this gasket go? Countertop dishwasher faucet adapter

I have an SPT brand countertop dishwasher. I forgot to push the red drain button before disconnecting the hose from the faucet adapter. The water pressure blew off this black rubber gasket. I can’t

The Danco dual Thread large fitting aerator adapter connects a portable dishwasher to the sink. This adapter will connect any device with female snap coupling to your sink faucet. It has the full water flow that you need and an easy connection to a dishwasher.

Danco Dishwasher Aerator Adapter

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