The BOLLFILTER automatic Type 6.72 has been specifically designed for smaller flow rates. Its task is the filtration of lubricating and fuel oils. The BOLLFILTER automatic Type 6.72 is self-cleaning and specifically designed to provide fine filtration down to 6 microns. It is also possible for a fuel filter to incorporate a bypass filter with manually operated 2 stages 3-way switch over valve to give 100% operation security.