Internal unions have female threads and a fitting detail for zero volume fittings. The nuts have male (external) threads.
The 1/32" nuts are fingertight; 1/16" nuts are available in a choice of fingertight or hex; and 1/8" nuts are hex, for wrench tightening.
| Description | Bore | Product No. |
|---|---|---|
| 1/32" fingertight | 0.25 mm | ZU.5FPK |
| 0.50 mm | ZU.5LFPK | |
| 1/32" | ZU.5TFPK | |
| 1/16" fingertight | 0.25 mm | ZU1CFPK |
| 0.50 mm | ZU1MFPK | |
| 0.75 mm | ZU1FPK | |
| 1/16" | ZU1TFPK | |
| 1/16" hex | 0.25 mm | ZU1CPK |
| 0.50 mm | ZU1FPK | |
| 0.75 mm | ZU1PK | |
| 1/16" | ZU1TPK | |
| 1/8" hex | 0.75 mm | ZU2PK |
| 2.0 mm | ZU2LPK | |
| 1/8" | ZU2TPK |