My 356 has Sherwood Hypro sea water strainers. I think they are 3/4 inch but they are not marked. Inner bowl is about 2 1/4 across and outer about 2 1/2. I saw that Groco makes a cap with hose fitting for their strainers. Anyone ever see if they fit a Sherwood? Or, is there something similar that does? Or, maybe, an outside the thru hull fitting that will work with an external strainer in place ( the boat came that way, no debates please. It's there.)?