used, good condition, works fine.

　　/product/prod_display.cfm?pcatid=4644&ref=4032&subref=AA&cmpid=PPC-G-4032

　　* For freshwater and saltwater aquariums

　　* Variable flow control powerhead great for undergravel filters

　　* Adjustable clamp fits most aquariums

　　This dependable model increases water flow through undergravel filters to improve their filtering efficiency. It also oxygenates water to sustain beneficial bacteria and optimize their biological filtration capabilities. Easily fitted to most undergravel systems and comes equipped with a tapered riser stem adapter, which accepts 1/2" to 1-1/8" tubing, adjustable flow control on all models except 110, filtered air intake, and an epoxy-filled motor. Models 20 and 30 feature a deflection shield for angled flow control, and Models 50 and 70 offer both forward and reverse water flow.

　　/product/prod_display.cfm?pcatid=4638