Monster Sucker kits include Big Sucker's modern "hidden vent" technology. The breathers are fixed with O-Rings to the heads, connecting directly to the injection or carburettor mouth to give greater efficiency to the engine breather without the need for external pipes. The filter elements are constructed in such a way as to take in air not only from the sides, but also from the top, resulting in a greater flow of air. The filters are constructed of water-resistant synthetic material which in many cases eliminates the need for a protective rain sock. The filters are reusable and require no oil, just a rinse. Ness Monster Sucker Kits can be used with or without a cover. The accessory rain sock can only be used without a filter cover. NB as professional sellers we can issue a regular invoice.