Sheeted Sweep Alley Attachment - SS-AAThe two gates that make up the SS AA create the beginning of an alley with pass through access for cattlemen to use for crossing through the alley. SS AA Sheeted Sweep Alley Attachment The SS AA is specifically designed for building a secondary alley off the main working alley in Prieferts Solid Sweep System. Each of the sheeted gates that make up this alley attachment kit allow for individuals to "pass through" the sorting alley without having to