Can try leaving filter out or wrap Teflon tape around threads? IMO nothing can do about it in most cases? most leak a little. You can buy new nozzles see if your odds improve finding one that don’t leak, but most will eventually. Or upgrade to Better head design? IMO nothing wrong with those, really no seal just the nozzle seals against shaft. I had new ones leak worse. Most of mid leak between nozzle two half’s. good luck trying to get to seal completely?
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