<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Hi All,</DIV><DIV> Have a question on thru hull fittings . Is there a minimum thickness that they need to be? Say if I had a 1/2" shaft going thru stainless round stock of 1 1/2" for a external valve, how much thicker that the hull does that need to be?</DIV><DIV> </DIV><DIV>Is this where the 100% replacement material rule of thumb come in?</DIV><DIV><BR>Thanks,</DIV><DIV> </DIV><DIV>Brian</DIV></DIV>