There are two types of check valves attachment. 1. Bayonet 2. Locking in rubber stopper. There is no compensation for bayonets. In that case, use the broken one as fuse like a connection and apply a straight check valve to the function = 678407. The one that locks in the stopper has: Article 687495 You can not change the attachment between the types, there are different pressures in the servo. This part replaces part no 9485451,680476,1228272,1211684