This is a Kingman factory replacement expansion chamber for the Spyder Compact S.E and compatible models. This 3 stage expansion chamber requires male to male, standard 1/8" NPT to metric fitting. Expansion chamber is 5 inches in length. 1.5 inches in width. Fits the Spyder Compact S.E., Spyder One, Spyder Classic, and Spyder Victor ( older version, no 2k+). May fit other models but no guarantees. Green and black camouflage color,