ECO vent filter assures that gases are completely filtered through activated odor-adsorbing charcoal media. The result is more thorough odor eliminatione. Hose adapters for the most popular vent hose sizes are included with the complete vent filter kit Earth-friendly, recyclable plastic components Complete kit includes fittings for popular vent hose ID sizes: 5/8 in., 3/4 in., 1 in., 1-1/2 in. (16mm, 19mm, 25mm, 38mm)