Originally Posted by tager
I don't totally understand why, but some advocate crossing your cockpit drain lines. Port to starboard, starboard to port.
That's done because you need the low side to drain when heeled. If the scupper in the low side of the cockpit is very close to the waterline it won't drain well and in some cases water will actually come in through the scupper if they are not crossed. You need to carefully lay out where the thru hulls need to go to to insure that they work properly.
I wouldn't use PVC pipe for your scuppers, go with the hose and seacock/thru hull.