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The drain tubes are brass, not copper. There are any number of ways to remove them but I usually just collapse them in on themselves by holding a large flat screwdriver against the lip of a tube, perpendicular to the hull, and strike the screwdriver shaft with a hammer to drive the lip in.

Then I used a pair of pliers to twist and crimp the tube in on itself until it is smaller than the hole through the hull and push it out.

Be careful not to chip the gel coat around the hole doing this.

Drain tube replacement is an FAQ. There are any number of discussions about how to do this.