Threaded end will not attach to GE or DAP silicone fittings regardless of pressure or torque. Some functionality was managed by removing (simply pulling out) the threaded sleeve, slipping the large end of the hose over the cut spout of the sealant hose, and generally using a small hose clamp. See photo. This is extra work for something advertised to make caulking hard-to-reach places easier. Can be useful if there is no other way to get to the sealant line, but useless otherwise.
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