This is NOT a bare valve, it comes with the fittings and airline for easy install. We often call this a Blowby Valve. It is a necessary item if you are or have added a Center Stand to your air ride system. Mount this valve on the frame of the bike and plum into the air line between the fill valve and the shocks. Whenever you park the bike on the center stand, leave this valve open to be assured the bike will not raise when you are away from the bike.