Holt 'O' Ring Hatch without a rubber seal.
Hatch 145 mm Properties
| Fixing Hole |
3 mm |
| Cut Out Size |
157 mm |
| Opening Size |
145 mm |
| O Ring Required |
HT.538 |
| Weight |
111 g |
The Holt HT.538 Sealing Ring can be found HERE
Hatch 100 mm Properties
| Fixing Hole |
3 mm |
| Cut Out Size |
110 mm |
| Opening Size |
100 mm |
| O Ring Required |
HT.338 |
| Weight |
62 g |
The Holt HT.338 Sealing Ring can be found HERE