Product Description Hose Adapter Male Elbow Available in 10 Sizes Polyethylene 6 Bar Pressure Tested All Diameters correspond to the I.D of the Hose. Male BSP Hose Diameter 1/2″ 12mm(1/2″) 3/4″ 12mm(1/2″) 1/2″ 16mm(5/8″) 1/2″ 20mm(3/4″) 3/4″ 20mm (3/4″) 3/4″ 25mm(1″) 1″ 25mm(1″) 1 1/4″ 32mm(1 1/4″) 1 1/2″ 40mm(1 1/2″) 2″ 50mm(2″)