Raypak Replacement Header Tube for Raypak 055B model gas heater. This is a new, OEM part, number: 004695F. This includes the front and rear headers. The front header includes the thermowell. The 2 tubes measure 13-1/4" in length. The total length of the tubes including th headers measures 18-1/4". Each header is about 5-5/8" x 2-7/8" tall.