Billet Specialties Part Number: 66935. Yogi's Inc. Part Number: BLT 66935. Bulkhead - AC & Heater 4-Port In-Line (Push-On). Billet Specialties. Billet Specialties heat and AC bulkheads are engineered to work with 5/8” heater hose and one #6 and one #10 AC line.
