Idex Large Bore Unions

Large Bore Unions

  • 5/16-24 and 1/2-20 flat-bottom threads

Use any of the 5/16-24 fittings on page 56 and the appropriate ferrule to create a true zero dead volume (ZDV) connection with the P-134 Union. Our U-658 and U-664 Unions are designed to be used with our standard 1/2-20 flat-bottom threaded nuts and ferrules (included with the U-658 and U-664 assemblies).

Serial Number



Large Bore Union PEEK for 5/16" OD


Union Assembly PEEK for 1/4" OD