Boston Fuel pre-filter is the special instrument which purifies and filters diesel oil. It can filter 90% machinery impurity, glue and asphaltum in fuel and guarantee fuel maximum cleanness. 1. Main Functions: (1)Filter 90% of impurity, glue and asphaltum in diesel oil (2)Reduce abrasion of cylinder and piston (3)Protect the nozzle and nozzle system 2. Main advantages: (1)Saving Diesel oil 5%--10% (2)Extension of engine life (3)Avoidance of engine malfunction (4)Purify air of the engine aft body 3. Specification: The size of vat: 400*185*370mm The size of oil tube: M 25 (can change) Rated flux: 10-100L/min Rated pressure: 0.2Kpa