The John Deere hydraulic oil filter AT318160 for 412R 550K 612R 700L 850K 4940 R4038 is a filter/regulator from John Deere. It sits in the supply line to a pneumatic or hydraulic system, keeping the fluid or air clean and properly regulated. It is commonly in pneumatic FRL (filter-regulator-lubricator) assemblies and compressed air systems.
