Shree Ram Pipe Fitting Stores

If by "Hydrant" you meant something related to an outdoor faucet or yard hydrant, it's unlikely to be correct terminology for this type of washer. Instead, hydrant-related valves often use metal or rubber seat washers, O-rings, or bibb washers, typically specified by size (e.g., OO size) and material suited to fluid/pressure control—not a PVC diaphragm