In the list of things that could sink your boat, this is among the top. Ever take a big wave over your boat? Wonder where the water drains to when you wash your boat? These deck drains are made to scupper the water back over the side. If the hoses are not connected the water will drain into and quickly fill the bilge. If your pumps aren't working, or they can't keep up with the influx of water the boat could sink. Hire a surveyor before you make that next boat purchase and you'll thank yourself later!