From Premier 1 site:
New design! Provides clean water to the flock year-round. Internal heater keeps water flowing in temperatures as low as -20°F.
We’ve listened to your feedback and have introduced several improvements over the previous version:
Larger capacity (3 gal)
Secure, interlocking lid
Heavy-duty handle for carrying and hanging
Detachable cord for non-winter use
A reliable heated poultry waterer for all seasons.
Lid is secured to the base via unique interlocking tabs...