Pumpheads for gear pumps BVP-Z: MCP-Z Standard and MCP-Z Process User-specific pumping heads: drive magnets and two hose connectors are reqiured for operating the magnet-coupled gear pumps. Temperatures -45 to +177°C. If you want to operate pumps with teflon fitments at more than 54°C: please specify this in your order: because operation up to 99°C requires alternative seals. Please note: The flow rate depends on the model. -magnets: see gear pump drives -Service kits available on request Further pump heads available on request.Type Z-181 : Gear material Graphite : Flow rate 3 - 252 ml/min.