Ram-Flo 400 Series air filter assembly to suit Weber DCOE 38 40 and 42 Carburettors fitted with slide in type air horns. Flange cut-out is central. The backing plate of this filter has special inserts which locate the auxiliary venturi in place. Not compatible with air horns. High volume, flame resistant and washable element can be used dry or oiled. This filter flows 400 CFM (cubic feet per minute) Dimensions: 177mm x 113mm x 50mm. Ram-Flo is the original and the best and 100% Australian made and owned.