20' Rough Stock Alley w/Alley Stop and Preg Panels - RSOS-6Similar to the RSOS 5, this 20 alley also includes 2 pregnancy panels. One of these panels can be easily reversed to serve as a sorting gate. RSOS 6 20' Alley w Alley Stop & Preg Panels This heavy duty 20 alley kit is a great way to add length to your Rough Stock Open Alley. The RSOS 6 includes a no back alley stop and two Rough Stock Open Preg Panels. With no tools, the no back Alley Stop can be easily adjusted to prevent cattle from backing out of