Model: 20ST10
20" Standard Depth Wound Poly Filter (20" x 2½") - 10 Micron..
Model: 20ST20
20" Standard Depth Wound Poly Filter (20" x 2½") - 20 Micron..
Model: 20ST50
20" Standard Depth Wound Poly Filter (20" x 2½") - 50 Micron..
Model: FCP1R20P
20 Depth Wound Filter 1M (20ST01 USA)..