STEP-1: Cut a hole through the hull
and backing block slightly larger than
the thru-hull fitting OD....
What is slightly larger?
I have an old datamarine transducer hole that is 2-1/16" in diameter. I want to put a 1-1/2" bronze grocco scoop strainer. Grocco does not say what it's OD is. any info on that would be great. I looked up the OD on a 1-1/2" NPS pipe, and it says 1.9".
So my question is....is 2-1/16 slightly larger or too big in comparison to 1.9"?