Gas Valve VAL09031 # 7 in the Drawing DIRECT VENT 2 STAGE, 1/2-14 NPT, 24V, 50/60 HZ, "J" SERIES USE VAL09031,BUT THIS IS NOT A DROP IN REPLACEMENT, THIS MAY REQUIRE TUBING MODIFICATIONS, IF YOU HAVE A 040 OR 060 UNIT YOU WILL ALSO NEED COV04012 DUE TO INCREASED LENGTH. IF YOUR MODEL NUMBER HAS H,C,X,Y IN THE THIRD DIGIT THE COV04012 IS NOT NEEDED.