Mineral oil FluidTAISEI CASE TYPE SUCTION FILTER Taisei-Kogyo Case type suction filter protects the hydraulic pump by preventing the circulation of line contamination from the reservoir tank. * Signature case type suction filter model* An abundant line up of upward extraction type elements with a substantial range of sizes (inner diameter 10A-150A) and a variety of options makes element replacement easy* The shape of the case prevents air accumulation within the case