Eth300 300 Watt External In - line Heater For 5/8" Hose
300W in-line aquarium heater suitable for all canister filters with 5/8" flexible . hosing.  No danger of damage if unit is run dry for short period as the ETH will . switch itself off before overheating.  Heats with high efficiency and designed to . avoid temperature variations caused by poor water circulation.  UL listed.  . Reliable and simple to use.  Extremely accurate.  Suitable for freshwater and . saltwater aquariums.  Ideal for tropical fish breeding situations.  For aquariums . 53-80 gallons. Length - 12"