 
     
 
     * pentru protectia impotriva uzurii prin frecare a furtunurilor
* spirala de protectie are 10 m lungime si nu se taie
| Cod | Pentru furtun | Exterior furtun (mm) | Diametru Interior (mm) | 
| D 17 | 2SN DN 06 | 15 | 17 | 
| D 19 | 2SN DN 08 | 16.5 | 19 | 
| D 21 | 2SN DN 10 | 19 | 21 | 
| D 23 | 2SN DN 12 | 22.2 | 23 | 
| D 27 | 2SN DN 16 | 25.4 | 27 | 
| D 31 | 2SN DN 20 | 29.3 | 31 | 
| D 40 | 2SN DN 25 | 38.1 | 40 | 
| D 34 | 4SP DN 20 | 32.1 | 34 | 
| D 41 | 4SP DN 25 | 39.7 | 41 | 
| D 34 | 4SH DN 20 | 32.2 | 34 | 
| D 41 | 4SH DN 25 | 38.7 | 41 |