- The End Cap is used for non-insulated spiral air ducts.
| Specs | D | H | a | t |
| 80 | 78 | 55 | 5 | 0.5 |
| 100 | 98 | 55 | 5 | 0.5 |
| 125 | 123 | 55 | 5 | 0.5 |
| 150 | 148 | 55 | 5 | 0.5 |
| 160 | 158 | 55 | 5 | 0.5 |
| 175 | 173 | 55 | 7 | 0.5 |
| 180 | 178 | 55 | 7 | 0.5 |
| 200 | 198 | 55 | 7 | 0.5 |
| 225 | 223 | 55 | 7 | 0.5 |
| 250 | 248 | 55 | 7 | 0.5 |
| 275 | 273 | 55 | 10 | 0.5 |
| 300 | 298 | 55 | 10 | 0.5 |
| 315 | 313 | 55 | 10 | 0.5 |
