the bowl is attached to the element the adaptor ring has a plurality of spaced ribs with projections that extend upward and radially outward to maintain the filter medium spaced from an inner wall surface of the casing a resilient member holds the filter medium between a top plate and the adaptor ring application_number US 30549494 A description a fuel filter assembly 10 for filtering and heating fuel for diesel engines and the like comprises a filter head 12 a spin on element 13 and collection bowl 15 the filter head is fastened to an engine or other suitable structure by flange 16 and supports the entire fuel filter assembly 10 preferably filter head 12 is a die cast head and includes therein typical inlet port 18 outlet port 19 and connected respectively thereto inlet chamber 21 and outlet chamber 22 filter head 12 is a generally circular structure having a flat annular mounting surface 24 at the lower portion thereof for sealing engagement by the spin on element 13 and further includes annular cavity 25 forming a part of inlet chamber 21 and surrounding a circular portion of outlet chamber 22 heater assembly 26 is received in cavity 25 of inlet chamber 21 and is secured in place by threaded tube 28 the central portion of which communicates with outlet chamber 22 filter head 12 further comprises vent port 29 and vacuum switch port 30 both of which are in fluid communication with outlet chamber 22 and return check.