Oase BioMaster 250 External Aquarium Filter. Excellent condition and fully functional. The BioMaster 250. • Model: Oase BioMaster 250. features an EasyClean pre-filter module, so you can clean the pre-filter without opening.
Beautiful piece of filtration, bought a 250 for my 40 breeder and it leaves the water crystal clear. The quality of plastics used is phenomenal and the built in heater is a big thing for me as it keeps me from having to have a heater in the tank itself.