low gallonage. Spray guide arm controls stream prevents side splash onto buildings and walkways. Pressure-activated wiper seal assures reliable pop-up and pop-down. Diffuser screw breaks water into smaller droplets for inform watering. 3 pop-up clearance. 4-1/8 x 8-5/8 rugged plastic case. 1/2 female connection at side or bottom. Permits more heads per valve. Especially for low pressure areas. Spacing from 25 to 43 apart. Length: 4.3. Width: 4.3. Height: 8.8