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Stainless steel tube-to-tube union fittings including standard unions, reducing unions, bulkhead unions, union elbows, union tees, reducing union tees and union crosses. Available in Imperial and Metric tube OD.
| Part Number | Fitting Type | Tube OD | Unit | |
|---|---|---|---|---|
| PBU-01-SS | Bulkhead Union (PBU) | 1/16(in) | Imperial | |
| PBU-02-SS | Bulkhead Union (PBU) | 1/8(in) | Imperial | |
| PBU-03-SS | Bulkhead Union (PBU) | 3/16(in) | Imperial | |
| PBU-04-SS | Bulkhead Union (PBU) | 1/4(in) | Imperial | |
| PBU-05-SS | Bulkhead Union (PBU) | 5/16(in) | Imperial | |
| PBU-06-SS | Bulkhead Union (PBU) | 3/8(in) | Imperial | |
| PBU-08-SS | Bulkhead Union (PBU) | 1/2(in) | Imperial | |
| PBU-10-SS | Bulkhead Union (PBU) | 5/8(in) | Imperial | |
| PBU-12-SS | Bulkhead Union (PBU) | 3/4(in) | Imperial | |
| PBU-14-SS | Bulkhead Union (PBU) | 7/8(in) | Imperial | |
| PBU-16-SS | Bulkhead Union (PBU) | 1(in) | Imperial | |
| PBU-20-SS | Bulkhead Union (PBU) | 1-1/4(in) | Imperial | |
| PBU-24-SS | Bulkhead Union (PBU) | 1-1/2(in) | Imperial | |
| PBU-32-SS | Bulkhead Union (PBU) | 2(in) | Imperial | |
| PBU-M03-SS | Bulkhead Union (PBU) | 3(mm) | Metric | |
| PBU-M04-SS | Bulkhead Union (PBU) | 4(mm) | Metric | |
| PBU-M06-SS | Bulkhead Union (PBU) | 6(mm) | Metric | |
| PBU-M08-SS | Bulkhead Union (PBU) | 8(mm) | Metric | |
| PBU-M10-SS | Bulkhead Union (PBU) | 10(mm) | Metric | |
| PBU-M12-SS | Bulkhead Union (PBU) | 12(mm) | Metric | |
| PBU-M14-SS | Bulkhead Union (PBU) | 14(mm) | Metric | |
| PBU-M15-SS | Bulkhead Union (PBU) | 15(mm) | Metric | |
| PBU-M16-SS | Bulkhead Union (PBU) | 16(mm) | Metric | |
| PBU-M18-SS | Bulkhead Union (PBU) | 18(mm) | Metric | |
| PBU-M20-SS | Bulkhead Union (PBU) | 20(mm) | Metric |
Tube unions join tubing to tubing, with a twin-ferrule compression end on every port and no threaded connection to equipment. They are used to extend a run, repair a damaged length, split flow between instruments or bring lines through a panel, and each port can be broken and remade during maintenance.
Straight types include the union (PU), the reducing union (PRU) for joining two tube sizes inline, and the bulkhead union (PBU) for passing tubing through a panel or cabinet wall. For changes of direction there is the union elbow (PUE) and the reducing union elbow (PRUE). For branching there is the union tee (PUT), the reducing union tee (PRUT), where the branch or run carries a different tube size, and the union cross (PUC) for four-way distribution.
All unions are stainless steel 316 and available in imperial and metric tube OD. Typical uses include panel penetrations, inline connections in instrument hook-ups and distribution of signal or sample lines. Using tube-to-tube unions instead of threaded connections where possible reduces the number of thread seals in a system.
