It ain't purdy, but a piece of duct tape over the top works really well. And you can buy rod holder bottom drain caps. They have a fitting in the bottom of them... just run poly tubing from one to the next, daisy chain style and run the tube out the back to your splashwell... never have to worry about them again, and it helps keep your flotation foam dry.
http://www.ebay.com/itm/PERKO-SPD-2-...#ht_3149wt_908
Oh, and if you want to just seal the bottom off, so water doesn't get into your boat, just go to home depot or lowes and buy some rubber pipe caps in the plumbing asile. They are cheap, a perfect size, fit tightly and make the bottom of your rod holder watertight. The only problem with them is your rod holder can (and will) fill up with water eventually. So keep a battery syphon squeeze bulb around to take the water out.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
Last edited by Destroyer; 05-10-2013 at 09:40 AM.
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