Glyn you asked if my head pan fitting/drain leads to anything in the bilges like a sump or collection tank and no it does not and did not come with one either. Sven our shower curtain drapes over the toilet seat, we get nothing wet in the head but the shower pan. I guess that I got lucky putting in the drain line because in slid right down the small opeing in front of the water tank and then straight back to the bilge sump. Sven I planned the shower drain and chain locker drain together, I only wanted one 1 1/4" Line running aft to the 4 foot sump. We carry 285 feet of 5/16" HT Chain and I wanted it to go as low in the boat as I could possibly get it to go. Since I wanted the chain to go so low (under the v-berth) that meant that I could not put in those drains you see in chain lockers where they just drill a hole in the hull of the boat, even with the bottom of the chain locker and then they put those stainless vent covers over them. What I did was cut the bottom of the chain locker bulkhead off from inside the chain locker. Then I glassed the foot of the v-berth bed back to the chain locker bulkhead. Now I had a one square foot hole in the bottom of my chain locker. Now my anchor rode could go into the first cuppy hole at the foot of the v-berth. In that first small cuppy hole under the v-berth is where I glassed in a fitting that I attached my chain locker drain line too. I ran that 20 or so feet of hose all the way back to the 4 foot sump under the engine. When I put in the shower drain I just added a tee to the chain locker drain hose and attached my shower drain. So my shower drain line is only 3 feet long because it attaches to the chain locker drain. So now my chain locker stays extremely dry and is very easy to clean, my anchor rode weight is just below the water line, my shower drains like a champ with the big hose, and all that bilge area we have for stowage on the E-39B stays 100% dry and all done with just one hose. Hope this helps.