| Midland Part Number | O-Ring Thread Size |
| 6408-O-4 | 7/16" |
| 6408-O-5 | 1/2" |
| 6408-O-6 | 9/16" |
| 6408-O-8 | 3/4" |
| 6408-O-10 | 7/8" |
| 6408-O-12 | 1-1/16" |
| 6408-O-16 | 1-5/16" |
| 6408-O-20 | 1-5/8" |
| 6408-O-24 | 1-7/8" |
Warning: This product can expose you to chemicals, including cobalt, which are known to the state of California to cause cancer and birth defects or other reproductive harm. For more information visit .