Sorry to hear Tom, we aim to help in every way we can, including as you say, pointing you to a particular product to see if it is what you are looking for. However, all of the sizes of this product are on the website page (Hole size 21mm, Cap Size 30mm, Length 65mm and 10mm male pipe connection)for you to establish if it is what will fit for your particular installation. I'm not sure what more we could have helped with?