Hey Stuart and Markee, The varment screens are a prime example of the kinds of things that Marquis could put in a little newsletter. (dare I say, like thermospas did). While my home made screens will keep out rats and mice, obviousy it isn't going to deter wasps or hornets this summer, so I will have to cover them with fine screen. But if I only used fine screen, the critters could chew through. I am guessing Marquis answer to covering those wholes prevents insects and varments. I would love to see it and I think it should be available for purchase to folks with older spas. I'll bet most average consumers never even think about this and the spa technicians end up having to deal with the damage when it occurs.