Модификации
| Ordering Number | Tube O.D. | Bend Radius |
| HTB-4S | 1/4'' | 0.56'' |
| HTB-4 | 1/4'' | 0.75'' |
| HTB-5 | 5/16'' |
0.94'' |
| HTB-6 | 3/8'' | |
| HTB-8 | 1/2'' | 1.5'' |
| HTB-6M | 6 mm | 15 mm |
| HTB-8M | 8 mm | 24 mm |
| HTB-10M | 10 mm | |
| HTB-12M | 12 mm | 38 mm |
| HTB-14M-L | 14 mm | 56 mm |
| HTB-16M-L | 16 mm |
