tubes for deck drains

[dcobbett]

I've removed the 30 year old brass tubes in each of the vertical, through the deck scuppers in my 1976 20'SF as an inspection/precautionary procedure (they were in pretty good shape) and I am wondering if anyone has reemed out the holes to allow for either thicker walled or larger ID replacement tubes? Anyone have any idea of how big an O.D. the wood block and glass encasement will safely take?

Also, a lot of owners seem to either keep this style of deck drain, or replace it with some version of a through the transom drain. Anyone running with both types of deck drains, and how has it worked out? Seems like it would be a back up if one or the other got clogged on a moored boat (mine will be) and it would potentially double the water removal rate in the event the boat took on a substaintial amount of water while in use.