Route 6 Equipment Parts, Inc. GET THE RIGHT PARTS THE FIRST TIME!! Cummins ISX15 Diesel Engine EGR Valve Assembly. # – 4336675, 4307166, 3685948, 3686356. Terms & Conditions of Sale. All parts guaranteed to be in useable condition unless otherwise noted. NO EXCEPTIONS WITHOUT VALID PROOF OF EXEMPTION. Route 6 Equipment Parts will not be responsible for any issues resulting from failure to confirm fit or finish before ordering. LOOKING FOR COMPLETE ENGINES & EQUIPMENT?? OLD FORGE POWER EQUIPMENT — ENGINES & EQUIPMENT.