For the Junior model only. Immersed length 180 mm - 2 poles - distance between flange holes 58 mm - flange 75x75 mm. Don't forget a gasket (not included)! Also, note the position of the female thread for the M4 stud on the high-limit thermostat: no longer in the center.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.