Hi Nick. I'm not sure about the thread size but it screws onto any standard outdoor faucet.
We do recommend taking them off for the winter months.
This fits a standard faucet which is 3/4 inches in diameter.
Yes, you can!
No, this product comes with 2 way connector.
I'm not certain, since this is zinc. However, there are lots of warnings about the dangers of brass because of chemicals used in the manufacturing process. Regardless, it's never safe to drink from a hose.
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It's only available online.