I am planning to have my 74 E-29 hauled and bottom painted. I also want to have the throughulls replaced as well. When the throughulls are replaced, are the seacocks also? Or are the seacocks replaced separately? I had a seacock pop off when I was closing it a while back, and it was a very unpleasant experience-requiring the entire throughhull to be replaced as well.How often should throughulls/seacocks be replaced?Thanks, Steve