Replacement Filter for Rusco Inc FS2 Sand Separator / Sediment Trapper. This replacement element is manufactured by Rusco Inc. for use with model # FS2. The polyester membrane is offered in 24 mesh, 60 mesh, 100 and 250 mesh. The membrane will also be periodically wiped clean during the flush valve. Over the years the membrane might progressively develop into loaded or damaged so as to require replacement. The exact measurement is 1 7/8 inch OD x 10 inch length. The 24 mesh membrane is an identical to 707 microns (0.0280 inches) . The 60 mesh membrane is an identical to 250 microns (0.0098 inches) . The 250 mesh membrane is an identical to 63 microns (0.0024 inches) .