Nuova Rade shower hose 5m, as commonly used by boat manufacturers including Quicksilver, Beneteau, Jeanneau etc..
The head has a 1/2" BSP thread for connecting it to the hose. The hose connection (to the pump) has a 3/8" BSP female thread.
DIMENSIONS
Shower hose thread: 1/2" BSP female / 3/8" BSP female
Length: 5m
All dimensions +/- 2mm