This is a Shock Absorber for Model 60 Titan Surge Actuators. Each titan Model 60 contains one Shock inside of it, this is a replacement for that shock. The performance of this shock is important to your Surge Coupler and replacement is fairly straight forward. This is Titans Part #2336200. If you are noticing while braking, that your trailer slams harder or even makes a loud bang, their is a very high likelihood that your shock is worn and needs to be replaced.