Winterizing water system and jabsco toilet

This is our first winterizing on our 2005 rinker 282 bowrider
Need suggestions on how to winterize the water system and the jabsco toilet
Anyone know where both seacocks are for the toilet?
Need suggestions on how to winterize the water system and the jabsco toilet
Anyone know where both seacocks are for the toilet?
Comments
Many you tube videos about it.