The OASE FiltoSmart 300 ThermoFit allows the Oase HeatUp 300 Watt Aquarium Heater to be securely fitted into the OASE FiltoSmart 300 Canister Filter. This accessory creates a watertight seal that is necessary for aquaria.
OASE does make a FiltoSmart 300 w/ Heater that already has the heater installed.This product is for those who purchased the non-heater version and have now decided to add a heater.
