No other product invented by the Priefert family has had more of an impact on the cattle industry than the full front-opening headgate invented by Marvin Priefert in1964. The model 91 headgate is based on Marvins original design and is by far Prieferts most popular headgate to date. If you are in the market for a good headgate that will not only stand the test of time, but also increase your productivity and efficiency, then this is the headgate for you. The HG91 provides safety for both animal and operator, helping to take some of the work out of working cattle. Prieferts model 91 headgate operates in manual or automatic mode and its infinite locking system is assured for life.