from my notes:
Head-in, engine & anchor: 3/4" NPT.
Galley sink & Head-out: 1-1/2"
Head sink: 1-1/4".
Remember, seacock raises hose attachment point, so you might need to replace straight barb with 90 deg barb. I ended up with slight service loop in anchor locker that traps alittle water. Obviously if you leave anchor seacock closed, locker fills w/rain. (But fuel port is above lower edge of locker so port should not submerge). Double clamp hoses below WL.
