This kit includes all parts necessary to remove the charcoal canister and emissions control air injection system. The air injection system must be removed or bypassed to effectively tune a fuel controller such as a Bazzaz Z-Fi or Dynojet Power Commaner PCV. Removing the charcoal canister and all parts of the air injection system also removes 2 lbs from the bike (a few ounces get added back with the block off plate). Save yourself the time and hassle of trying to find the correct size rubber caps and buy this complete kit. Kit includes: (1) Norton Racing Smog Block Off Plate (2) 3/16? EPDM Rubber Vacuum Caps (1) 1/2? EPDM Rubber Vacuum Cap This kit is for closed course race use only.