Antelco 45515 Green Back In-line Coupling Valve for 1/2" Drip Irrigation Systems In-Line BxB Coupling Valve for 1/2" (0.61" = 16mm ID x 0.73" = 15.7 mm OD) 3/4 BSP Male threaded inlet or 1/2 MNPT threaded inlet, Simple on-off operation and straight through flow Operating pressure range up to 300 kPa, Green Back cap for standard irrigation applications UV stabilised materials for long life