This topic does not seem to come up much. Deck fills have o-rings. These keep the water dust and dirt out. I inspect mine ever time I open the deck fill and at least once per year for the others In the winter I also remove them, clean them up, inspect under a very bright light for cracks and deformities, apply new silicone grease and close the deck fill. On my fuel deck fills I switched to food grade silicone o-rings since cleaning up polluted fuel could be a nightmare. After 5 years, I changed the silicone ones for new ones. As far as I could tell, the old ones were still in near perfect shape. New ones seem to cost under $1 a piece and it seemed that it was just cheap insurance to put new ones. I also put them on the other deck fills. Seemed like the right thing to do. Lee Levent Marina, Izmir Turkey -- https://www.facebook.com/leezeforsale/ http://leezeforsale.com https://whereisleeze.blogspot.com/ leezerphtrawlerforsale@gmail.com

The O-rings on our boat's deck fills, water, diesel and paint thinner are 15 years old and showing no signs of age. Like Lee we also look them over when we unscrew the caps. I often wonder how long they'll last before needing replacement. *Rudy & Jill Sechez * *BRINEY BUG-a 34' Sail-Assisted Trawler * *Anchoring Consultants @ trawlertrainingabc.com <http://trawlertrainingabc.com> * *850-832-7748 * *Cocoa FL* > >