On 2 Apr 2007 00:06:03 -0700, "Chuck Gould"
wrote:

What sort of screws would you recommend, Jim?
He doesn't want to use bronze or steel fasteners on that fitting or he
will soon have a drain hole on that aluminum boat a heck of a lot
bigger than he wanted. The fitting itself is plastic, which eliminates
the corrosion from that source, but it looks like it needs to be
fastened on with screws and that might be a concern unless carefully
and properly done.

I have put a *lot* of stainless steel screws into aluminum back in my
sailing days. There is usually no issue at all unless you are in salt
water and want to get them out at a later date. In that case the
threads need to be coated with silicone sealant before installing.