1979 20' SF Question

[ztagator]

Bought a new boat this weekend, a 1979 20' SF. I have a few questions:

1- What are the side vents on both sides of stern called and what are their function. Should the vents be facing stern or bow? I have one of each with a dryer type hose connected to one.

2-I hear alot about these boats being sinkable? Could someone explain why they would sink and how to have a sink-proof plan in place?

3- Is there a better scupper than the rubber ones. Mine are above trim tabs and it seems to me that water could get in.

Thanks,

ZtaGator