| Tunstall No. | Size | For Erwel Trap Model # | Head |
| 1FP-ER-15 | ¾" | Erwel #F-15 | YES |
| 2FP-ER-15 | 1" | Erwel #F-15 | YES |
| 1FP-ER-30 | ¾" | Erwel #F-30 | YES |
| 2FP-ER-30 | 1" | Erwel #F-30 | YES |
| 1FP-ER-75 | ¾" | Erwel #F-75 | YES |
| 2FP-ER-75 | 1" | Erwel #F-75 | YES |
| 1FP-ER-125 | ¾" | Erwel #F-125 | YES |
| 2FP-ER-125 | 1" | Erwel #F-125 | YES |