Install your ballast pumps without drilling any new holes using the factory thru-hull drain fitting.
If your boat has an extra drain plug fitting in the bilge you can use it as the water source for your ballast system using this 3/4" brass nipple. That means you don't have to drill any new holes in your boat below the water line when installing an automated ballast system, which is something everyone can appreciate.
Just remove the t-handle bilge plug, thread this fitting in its place, attach a bronze ball valve (see recommended accessories), and make your connection for the type of pump you're using.
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Just use the existing hole.
My malibu has redundant drain plugs. I used this fitting in lieu of drilling two holes.
I've got two rear sacks driven by parallel Johnson pumps:
- One sack has a new 1" hole and 1" shut off... the rest is 1" tubing, fittings, etc.
- One sack uses the existing 3/4" hole and a 3/4" shutoff. ... the rest is 1" tubing, fittings, etc.
The fill/drain time between the two sacks is negligible.