Woodford Y1 Complete HeadWoodford 15001 Complete Y1 hydrant head. This head is for Y1 hydrants with a 1 5 8" outside Diameter Riser Pipe. When replacing a head, it is always a good idea to replace the plunger since the head is already off. The Woodford Y1 complete head is a crucial component used in outdoor water supply systems, particularly frost free hydrants. Lets explore its features and functionality: Design and Components: The Y1 complete head is specifically designed