◎ I used to replace this every year, but I learned from the manual that it should be replaced every 5 years. This is an electrode that was used for one season. I will sell it to someone who can use it. Used for a short period of about 3-4 months during the winter season. ■ Model used F-MV4100 ■ Compatible models F-MV4100 series F-MV3000 series Others