I have the stainless steel screen on my water heater, got it from my dealer. My age of rig may have a different water heater, however. I would use steel wool by it's self to plug the holes, that's what we do in our RV home base when we leave for the winter. I would not use that foam on my rig anywhere, but that's because I've had problems with it in the past, particularly if I decided I shouldn't have put it somewhere or want to remove it.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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