I used a klx110 pet cock on my kdx 200 plastic tank which has the same bolt spaceing as my k5 , i think all them 2 stroke plastic fuel tanks pet cocks swap over on kx 2t . but the one on a kdx200 steel tank will not fit , i tried it .the klx110 one is easier to turn and has a small researve as well as being shorter then the kdx one which gave me more room around carby area.