Penn-Plax Cascade Heat Preset Submersible Aquarium Heaters
8 Inch / 100 Watt - Up To 20 Gallons
2 Top Quality Suction Cups Included

Fully submersible - can be placed in tank horizontally or vertically.
For fresh and salt water aquariums.
Automatically sets and maintains desired temperature.
Visible temperature setting scale and accurate to one degree.
Heavy duty shock resistant glass - safer for larger fish.
Top quality heating element with superior insulation and heat distribution.
Lifetime guarantee.