The OASE FiltoSmart 200 ThermoFit allows the OASE HeatUp 200 Watt Aquarium Heater to be securely fitted into the OASE FiltoSmart 200 Canister Filter.This accessory creates a watertight seal that is necessary for aquaria.

OASE does make a FiltoSmart 200 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.