Complete Garden Rainwater Harvesting Systems: combining the Wall Tank (s), Filter Collector, Automatic Garden Steel Pump, Pump to Tank Connector, rainwater level Sight Gauge, & Tank to Tank Connectors. Each Wall Tank System. Consists of: Wall Tank (s) dependent on system size (800 litre/tank). Tank to Tank Connector (s) to connect all tanks together. Filter Collector, the class leader filter diverter for UK downpipes. Tank Water Level Gauge. Garden Steel Pump with multi-hosetail outlet & carry handle. Tank to Pump Connection Kit. Chosen by irrigation professionals & homeowners alike.