Coupling for Threaded Type
| GRBCO 12 | Threaded 1/2″ |
| GRBCO 58 | Threaded 5/8″ |
| GRBCO 34 | Threaded 3/4″ |
| GRBCO 1 | Threaded 1″ |
Coupling for Standard Type
| GRBCO 12NT | Rod Dia. = 1/2″ (12.7 mm) |
| GRBCO 58NT | Rod Dia. = 5/8″ (14.2 mm) |
| GRBCO 34NT | Rod Dia. = 3/4″ (17.2 mm) |
| GRBCO INT | Rod Dia. = 1″ (23.1 mm) |