This brass elbow screw in connection is designed with female threads and a compression ring connection. Connection 1 has R 1/4 inch threads.
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Brass Elbow Flaring Fittings Connector Pipe 6/8/10/12mm To 1/8 1/4 3/8 1/ 2 Male Thread Air Conditioning Extension Adapter - Pipe Fittings - AliExpress
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