Installation Instructions
These filters are made with a polyurethane that is much stiffer than the OEM foam. This is to ensure these will last through many installations.
If the filters are not going on easily do not push on the end of the filter. Make sure the worm clamp is loosened all of the way.
Hold the base of the filter and rock the filter back and forth while you push the filter on, evenly. This way you do not risk crushing the media.
You can also use a silicone grease lightly on the flange surface.