Packing Gland
I repack mine every year. It takes only about 30 minutes. I use teflon impregnated packing and I barely have a drip. Water sweats out when the shaft is turning. As long as the shaft log does not get warm, you can limit the amount of water that drips out to almost nothing. Repacking each year keeps the packing lubricated and flexible. If you want to content with drips you can leave it in for more then a year.