On my previous M 15 I installed a Nicro Water Trap with a Nicro low profile flexible cowl. It allows air in but keep rain water out. I removed it while sailing and put the insert in. Remember to using penetrating epoxy on the balsa before bedding. Bert M 15, Zephyr ************** Gas prices getting you down? Search AOL Autos for fuel-efficient used cars. (http://autos.aol.com/used?ncid=aolaut00050000000007)