OASE FiltoSmart 100 ThermoFit Water Tight Heater Pre-Insert Part# 48507

OASE FiltoSmart 100 ThermoFit Water Tight Heater Pre-Insert Part# 48507

This ThermoFit Pre-Insert part is necessary if you decide to add an internal heater to your existing canister filter.  The required part creates a water tight seal for your heater to operate safely and prevent your canister for leaking.