This Isuzu fuel filter case 8971798550 8-97179855-0 for 4JG1 4JB1 4BD1 4BG1 engine is a filter/regulator manufactured by Isuzu. 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.
