Just search for Barbed Check Valve of the size needed and you'll find plenty. Uline has plenty of them.
Having said that, I'm not sure why it's there, unless the faucet folds down into the sink, then it would be used as a backflow preventer in case water got left in the sink and the faucet got folded down.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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