If you have 1/2" ID hose then you buy 1/2" fittings. Most fittings don't give you a choice on inside diameter. Although if you check, a lot of nylon and plastic fittings have a greater actual inside diameter. They're all a bit different on the ID of the fitting. Look at them and compare when you buy. I have some that I got from Danger Den that are 1/2" fittings but I have some 3/8" nylons that I got locally that measure larger on the ID.
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"The more I learn the less I know, but I never knew as much as when I was sixteen"
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