It is a washable and reusable unit with Steel top, Gauze Filter and rubber base. They add style and performance and fits most upright applications. Constructed with a super strong molded pliable rubber flange which absorbs vibration, they are available in Oval and Round styles. Neck can be stretched up to 1/16" for added applications. Use with or without 90 º Nylon Vent tube (included). Comes with clamp.