Hydor Inline Aquarium Heater 300 Watt With 5/8" Hose Connections.

* Prevents temperature variations caused by poor water circulation
* Precise, accurate temperature setting
* Indicator light shows when unit is "ON"
* Double insulated and double sealed

The first compact aquarium heater that operates externally, saving interior aquarium space. Installs vertically in the return line of a canister filter or sump, allowing better heat distribution as water returns to the aquarium.
UL-listedBuilt-in clamps for easy plumbing, and temperature adjusts from 65-93°F on an ergonomic knob. Durable, plastic casing protects internal parts. Indicator lights up when heating. 5-1/2 ft cord.
UL-Listed.