to drain the shower. It took me weeks, actually years to get the bilge cleaned up. The yachk water drained onto the top of the water tank and then into the bilge. There was hair, soap scum and "other" stuff all over the top of the tank and all through out the bilge. It wasn't until I replaced the fuel tanks that I was finely able to get completely clean. I fiber glassed the hole up and installed a Jabsco Water Puppy and an on off switch before I was finely satisfied with the arrangement. I highly suggest you keep the soap scum out of the bilge.