Brass Nickel Plated Washing Machine Dishwasher Tap Y Dual Splitter 3/4"BSP
It should also have a depth of approx 9.5mm. If not, once the Y piece has been tightened all the way to the sealing washer, you may not be able to operate the lever. 3/4" BSP Female spinning nut onto the tap incorporates sealing washer.