the product includes the entire kit
Yes, Its shutoff completely but I would still recommend shutting the main value and make it a habit since over years of usage there is a possibility that they can start leaking.
The t adapter doesn’t but can is you don’t use the T
I didn’t try to install mine to a faucet. I think that would be a hassle, though, honestly. Just give yourself the zing of a chilly mini shower.
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