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Message: <blockquote data-quote="Stevum" data-source="post: 521867" data-attributes="member: 36924"><p>I had to install a drain plug on 2 aluminum boats that I have owned. The most convenient & economical method I used was to take the plug style you intend to use with you to the hardware store & find a small connection fitting of PVC that fits the outside diameter of your plug along with a nut that fits the thread pitch & a couple of rubber gaskets. Use a hole saw that will allow the fitting to go through the transom, drill the hole out and slather each side of the washers & fitting with a flexible silicon caulk & thread them together for a compression fit. Make sure when you plan where the hole will go you leave enough distance from the floor of the boat to allow the nuts on the fittings to be completely flush with the transom for a proper seal. After you have it positioned & snugged it down you can apply more silicon caulk around the whole system (I use a rubber glove to smooth out the caulk with my fingers for a better seal & appearance). I let mine set for 48 hrs before inserting the plug & using the boat.  Just my 2 cents</p></blockquote><p></p>