need thread adapter for water faucet supply from europe to usa

Take the faucet with you to the plumbing store to match up. They may have to make up lines for you if they truly are non-standard.

The proper connection may not be obvious, like when a straight NPS female thread with a rubber gasket seals to a tapered NPT male pipe thread. Some household examples are sink and toilet feed lines and kitchen and shower spray hoses.

A similar apparent mismatch with the misleading name of "swivel" is common in hydraulics. They have a compressed metal-to-metal seal that swivels only before final tightening.

-jsw