On this product page you will find a casted and machined L fitting. This L fitting has a male and a female thread. The Male thread is a ¼”BSP-G thread and on the other side a female ¼”BSP-G thread. This item has been made from brass in Italy. So it is possible that you receive a item in solely brass or a model with a nickel coating.
On this product page you will find a T fitting. This T fitting has on each side a female connection. The threads used are 1/8” BSP-G thread. The fitting is made from casted and machined brass in Italy. It is possible that you get a plain brass item or a nickel plated one. For functioning that doesn’t matter.