1590 Series
90 Degree Adapter Union
| Piper Part Number | Short Description | Alternate # | SAE# | Thread A | Thread B | Dim C | Dim D |
| 1590-02-02 | 02FPS-02FP 90 DEGREE ELBOW | 1502-02-02 | 140231-02-02 | 1/8-27 | 1/8-27 | 0.65 | 0.68 |
| 1590-02-04 | 02FPS-04FP 90 DEGREE ELBOW | 1502-04-02 | 140231-02-04 | 1/8-27 | 1/4-18 | 0.75 | 0.94 |
| 1590-04-02 | 04FPS-02FP 90 DEGREE ELBOW | 1502-02-04 | 140231-04-02 | 1/4-18 | 1/8-27 | 0.78 | 0.94 |
| 1590-04-04 | 04FPS-04FP 90 DEGREE ELBOW | 1502-04-04 | 140231-04-04 | 1/4-18 | 1/4-18 | 0.78 | 0.94 |
| 1590-04-06 | 04FPS-06FP 90 DEGREE ELBOW | 1502-06-04 | 140231-04-06 | 1/4-18 | 3/8-18 | 0.87 | 1.06 |
| 1590-04-08 | 04FPS-08FP 90 DEGREE ELBOW | 1502-08-04 | 140231-04-08 | 1/4-18 | 1/2-14 | 0.93 | 1.25 |
| 1590-06-04 | 06FPS-04FP 90 DEGREE ELBOW | 1502-04-06 | 140231-06-04 | 3/8-18 | 1/4-18 | 0.92 | 1.06 |
| 1590-06-06 | 06FPS-06FP 90 DEGREE ELBOW | 1502-06-06 | 140231-06-06 | 3/8-18 | 3/8-18 | 0.92 | 1.06 |
| 1590-06-08 | 06FPS-08FP 90 DEGREE ELBOW | 1502-08-06 | 140231-06-08 | 3/8-18 | 1/2-14 | 0.99 | 1.25 |
| 1590-08-06 | 08FPS-06FP 90 DEGREE ELBOW | 1502-06-08 | 140231-08-06 | 1/2-14 | 3/8-18 | 1.00 | 1.25 |
| 1590-08-08 | 08FPS-08FP 90 DEGREE ELBOW | 1502-08-08 | 140231-08-08 | 1/2-14 | 1/2-14 | 1.00 | 1.25 |
| 1590-08-12 | 08FPS-12FP 90 DEGREE ELBOW | 1502-12-08 | 140231-08-12 | 1/2-14 | 3/4-14 | 1.12 | 1.43 |
| 1590-12-08 | 12FPS-08FP 90 DEGREE ELBOW | 1502-08-12 | 140231-12-08 | 3/4-14 | 1/2-14 | 1.19 | 1.43 |
| 1590-12-12 | 12FPS-12FP 90 DEGREE ELBOW | 1502-12-12 | 140231-12-12 | 3/4-14 | 3/4-14 | 1.19 | 1.43 |
| 1590-12-16 | 12FPS-16FP 90 DEGREE ELBOW | 1502-16-12 | 140231-12-16 | 3/4-14 | 1-11 1/2 | 1.27 | 1.75 |
| 1590-16-12 | 16FPS-12FP 90 DEGREE ELBOW | 1502-12-16 | 140231-16-12 | 1-11 1/2 | 3/4-14 | 1.31 | 1.75 |
| 1590-16-16 | 16FPS-16FP 90 DEGREE ELBOW | 1502-16-16 | 140231-16-16 | 1-11 1/2 | 1-11 1/2 | 1.31 | 1.75 |
| 1590-16-20 | 16FPS-20FP 90 DEGREE ELBOW | 1502-20-16 | 140231-16-20 | 1-11 1/2 | 1 1/4-11 1/2 | 1.55 | 2.00 |
| 1590-20-20 | 20FPS-20FP 90 DEGREE ELBOW | 1502-20-20 | 140231-20-20 | 1 1/4-11 1/2 | 1 1/4-11 1/2 | 1.62 | 2.00 |
| 1590-24-24 | 24FPS-24FP 90 DEGREE ELBOW | 1502-24-24 | 140231-24-24 | 1 1/2-11 1/2 | 1 1/2-11 1/2 | 1.75 | 2.25 |
| 1590-32-32 | 32FPS-32FP 90 DEGREE ELBOW | 1502-32-32 | 140231-32-32 | 2-11 1/2 | 2-11 1/2 | 2.31 | 2.50 |
Design and Dimension Subject to Change Without Notice.