Muffle knee
| Size | Order number |
| 3/8″ | 51020038 |
| 1/2″ | 51020001 |
| 3/4″ | 51020002 |
| 1″ | 51020003 |
| 1 1/4″ | 51020004 |
| 1 1/2″ | 51020005 |
| 2″ | 51020006 |
| Size | Order number |
| 3/8″ | 51020038 |
| 1/2″ | 51020001 |
| 3/4″ | 51020002 |
| 1″ | 51020003 |
| 1 1/4″ | 51020004 |
| 1 1/2″ | 51020005 |
| 2″ | 51020006 |
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