The J-Type Marine Gearbox™ coupling O-ring fits between the coupling and gearbox housing shaft bearing.
There are two sizes of the J-Type Coupling O-ring, each suitable for the relevant gearbox age and configuration. The options are:
| L230A | L230B | |
| Suitable for | J-Type Mk1 Gearboxes | J-Type Mk2 Gearboxes |
| Shaft Size | 7/8" | 1" |