Product Description Includes vacuum breaker cap, underbody, o-ring, and plunger. Air vent assembly for Arrowhead frost free hydrants, 420 & 455BFP series. From the Manufacturer Arrowhead Brass has provided contractors with high quality, high reliability, "Made-In-USA" products for over 75 years. We believe that improving a contractor's productivity and reducing call backs are one of our major objectives. While the majority of products containing the Arrowhead Brand are made in the USA, a few items as well as some minor components are imported.