Burnett & Hillman 1MBP128 - M12 x 1.5 Metric x 1/2" BSP Male/Male — FluidAirFittings
Straight G1/2 Bsp Male Thread to 1/2 Inch 12.7mm Hose Barb End Plastic Threaded Pipe Fittings - China Male Thread to Barb Fitting, Threaded Pipe Fittings | Made-in-China.com
Poly Hosetail 1/2" BSP Female to 13 mm hosetail : Amazon.co.uk: Garden