Should this be removed from the outdoor faucet in the wintertime to prevent freezing, or can it be left on the faucet as long as the faucet is turned off and both sides of the the Y adapter are left open? I live in Colorado.

Hello ARan, Thank you for reaching out to us. It is a good idea to properly store any garden tools during the winter. Proper storage will help extend the product's longevity and maintain performance. We highly recommend you store the shut-off indoors during the Colorado winter, Regards,