The replacement filter includes a small silicone hose and connector. This is used by the Zero Smog 4V to measure differential pressure through the filter to indicate when the filter is full. Â
The filter also fits Zero Smog EL and TL filtration units as a performance upgrade to the standard filters found in those units.Â
The life of a main filter is extended by using it in conjunction with prefilters. Prefilter packs and the Main filter also can be purchased as a set for convenience and at a reduced price (part number FT91000042).