there are 2 service kits for flow sensors
HFS and simple shut-off valves
HFSO:
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5510225 SET 6x SERVICE KIT HFS/HFSO EVO
is recommended for HFS and HFSO with shut-off Valve 'EVO' and it must be replaced every 4500 hours (milking + washing) or 1 year
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5620169 SET 6x SERVICE KIT HFS/HFSO STD
is recommended for HFS and HFSO with shut-off valve 'standard' and it must be replaced every 4500 hours (milking + washing) or 1 year
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