As mentioned earlier these extension tubes will not fit standard caulking tubes that you buy from Home Depot, Lowes etc. Do not fit, thread/bite the ends of the tubes. BUT I've found that if I first soften the tip of the sealant hose with a heat gun, I can then secure the extension hose. You will need to support the extension with your other hand while applying the sealant. It kind of defeats the whole purpose of the extension tube: we need them because we can't reach where we want to apply sealant - so why does the manufacturer think we can reach with our other hand to support those fragile extension tubes?
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