Straight fitting with male thread 1/2" cylindrical BSP for tube Ø 15L mm outside - Hidraflex
British Standard Pipe - BSP
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