Self-draining

Mansfield anti-siphon frostproof sillcocks assure protection against zing and undesirable back-siphoning

Because they're frostproof, they can stop outside hydrants from zing and bursting the pipes

Plus, the anti-siphon feature protects against water siphoning back to contaminate the potable water system

Also, unlike anti-siphon attachments, which must be manually drained to prevent zing, the integral anti-siphon design is self-draining

1/2" sweat inside, 1/2" IPS outside