Dan I did mine thru the transom. I used 2 inch pvc and the large ray-bud ping pongs 3 inch on the outside. On the inside I put a threaded pvc union so I could plug them this also gave me a ridge or neck that fit nice on the inside of the transom bulkhead. Make sure if you go this route that you mount the ball seals the right way I called ray-bud to answer this question as there was some conflicting ideas as to how to mount them.. I will look to see if I have any photo's. Also look on this site as their has been nice ones done with the stainless thru hull fittings that have flappers. Discount Marine in Bradenton Fla had some really nice ones that were 3 inch in diameter with the flappers I toyed with using them as well. Hope this help's and does not confuse you it is a hard choice what to do.. I like the idea of being able to drain water off the deck fast when you take a big greenie over the bow LOL..
Josh
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Outermostangling Charters
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