A question for all of you on the sink drain

[ebb]

I hope it's OK for big mouth to post again.
I would go with what Bill@231 says.

BUT
once you remove the old tube and repair the holes conservatively with feathering and fiberglass disks to the strength of the hull. .... then you can try the seacocks for the best position on the hull in relation to the aft cockpit drain tubes. You may find that your new holes go at least partly through your new repair.
If you use a real seacock you will have an epoxxied backing blocks to mount the valves to and to drill the three bolts through. You also will be shortening the hose length, which may make a good connection harder.

If you are upgrading completely you will need to find a "wet exhaust" type hose (instead of sanitation hose) for the connection. There is nothing stiffer than reinforced hose. There is almost no room to make the "double bend" from the cockpit to the valves.

I ran my cockpit drains out the stern. I can't defend this option because it has some problems.
But I did run the sink to its own 1 1/2" Marelon seacock. The length of tube from the sink drain to the valve barb extension is very short - but at a similar angle that the cockpit seacocks would have.
You can look at many kinds of reinforced hoses at McMasterCarr. I would choose a hose with plastic wire reinforcement. I bought some translucent green pvc stuff that seems pliable enough to make the turn in the short length and seat well on both barbs. Most hoses are rolled and come to us with a set curve that helps make the connection.
However I'm convinced I really need a Trident brand silicon wet exhaust hose - just one foot of it will cost a bomb - because it is slightly flexible, is made with fabric and is less likely to get pierced, and less likely to collapse when bent, smooth inside and has a long warranty...
Haven't got it yet, Been waiting for a tip from somebody here..