Ships from manufacturer, typically in 5-7 business days Lifegard Aquatics Heater Modules provide stable temperature control by reciruclating aquarium water continuously around the heater element. Accepts 1" or 3/4" diameter aquarium heater (not included). Compression coupling allows easy installation and removal of heater Removes unsightly and fragile heaters from aquarium Overflow pipe automatically vents air from chamber Clear cap to view "on" indicator light SKU Model Size Heater Size Aquarium Size* Inlet/Outlet Height R179210 AF-92 Individual 12" Length 100 Gallons 3/4" FPT 1" FPT 54" R179220 AF-92-19 Double 22" Length 200 Gallons 24.75" R179230 AF-92-29 Triple 34" Length 300 Gallons 34.5" *Recommended aquarium sizes are approximate. In many cases, modules can be used with great success in higher volume applications Manual