External nuts with female 1/4-28 threads are designed for use on tubing with a flanged end, just like the standard tube end fittings. Use them instead of a union or coupling to make a zero volume butt connection.
| Tubing OD | Material | Product No. |
|---|---|---|
| 1/16" | PEEK | CEN1PK |
| CTFE | CEN1KF | |
| 1/8" | PEEK | CEN2PK |
| CTFE | CEN2KF |
