Please use an Installation Tube of 27-28mm I.D.1" I.D. tube is too small and will damage the spring loaded seal.
Same Impeller 19721-003-0000 Fits 250, 400, 800, 1000
This Temp Sensor is most common and has a Sensor Shaft O.D. of approx. 8.3mm and the O.D. of the Threads is 12mm.Newer models use the 3-Prong Temp Sensor = P010000391300010
