The Reef Octopus SRO XP8000E Recirculating External Protein Skimmer takes the XP8000 platform outside the sump for maximum contact time, recirculating through the Bubble Blaster HY-10000 pinwheel pump. The full cone body reduces back pressure on the pump for stronger air/water draw, and an oversized air silencer keeps operation quiet despite the pump's size. Best for: large reef and mixed saltwater systems needing external, high-capacity recirculating skimming Setup: external, recirculating — requires a separate feed pump Pump: Bubble Blaster HY-10000 pinwheel pump Body: full cone body, bubble diffusing chamber with directional flow guide lid, waste drain, unit venting As with other SRO ext models, this is a recirculating design and needs a dedicated feed pump — factor that into your plumbing plan before ordering.Compatible replacement parts: Bubble Blaster HY-10000 pump kits and collection cups for the SRO XP8000 series.