Click to expand Tap to zoom Extension set - Solar volume flow meter 1-13 l/min by FLAMCO UK SKU M45110SET17 With flow rate meter 1 - 13 l /min, fill and drain valve with 1/2 hose fitting, G 3/4 M with end cap (e.g. for MM connection) bottom connection: 3/4 F, top connection: 1 union nut. Accessories