I've also used swimming noodles to cover the gutter spouts and haven't had any issues with them as yet. I've cut and trimmed noodle pieces which are wrapped around the spout with tape and no broken spouts to date. I know about your concern regarding the increase pressure on those spouts but, touch wood, mine have stood up over a period of 3 -4 years.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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