Product Description Quick Coupling Female BSP Available Sizes: 3/8″ Female BSP, 1/2″ Female BSP, 5/8″ Female BSP, 3/4″ Female BSP, 7/8″ Female BSP, 1″ Female BSP, 1 1/4″ Female BSP, 1 1/2″ Female BSP, 7/8″ suitable for certain 3/4″ Bib Taps (measure thread diameter – if around 29mm choose this option) To fit male thread sizes use the following guide; Female BSP To suit Male Thread with OD of 3/8″ 16.6mm 1/2″ 21mm 5/8″ 22.4mm 3/4″ 26.5mm 7/8″ 30.2mm 1″ 33.6mm 1 1/4″ 42mm 1 1 /2″ 47.8mm