The YH Roof Mount Top Well Seal Casting Mach from Woodford Mfg Co is a critical component for ensuring a watertight seal on roof-mounted hydrants. Crafted from durable materials, this casting is designed to withstand harsh weather conditions while providing reliable performance. Its precise dimensions ensure compatibility with various Woodford models, making installation straightforward. This top well seal is essential for maintaining the efficiency and safety of your hydrant system, making it a valuable addition for plumbing professionals.