These we make ourself and knowing the downfalls of the original part used by lay z spa we have designed our flow sensors on the original design but have encapsulated the magnet in a waterproof coating so water cannot penetrate it and cause the magnet to loose the magnetic properties..
There are others on the market but ours is the best version due to being based on the original part design and having the magnet fully encapsulated to stop early failure of the part.
